diff --git a/core/core.services.yml b/core/core.services.yml
index 1449b3b..8e9ca23 100644
--- a/core/core.services.yml
+++ b/core/core.services.yml
@@ -75,25 +75,12 @@ services:
     arguments: ['@config.cachedstorage.storage', '@cache.config']
     tags:
       - { name: persist }
-  config.context.factory:
-    class: Drupal\Core\Config\Context\ConfigContextFactory
-    arguments: ['@event_dispatcher', '@uuid']
-  config.context:
-    class: Drupal\Core\Config\Context\ContextInterface
-    tags:
-      - { name: persist }
-    factory_method: get
-    factory_service: config.context.factory
-  config.context.free:
-    class: Drupal\Core\Config\Context\ContextInterface
-    factory_method: get
-    factory_service: config.context.factory
-    arguments: [Drupal\Core\Config\Context\FreeConfigContext]
   config.factory:
     class: Drupal\Core\Config\ConfigFactory
     tags:
       - { name: persist }
-    arguments: ['@config.storage', '@config.context', '@config.typed']
+      - { name: event_subscriber }
+    arguments: ['@config.storage', '@event_dispatcher', '@config.typed']
   config.storage.staging:
     class: Drupal\Core\Config\FileStorage
     factory_class: Drupal\Core\Config\FileStorageFactory
@@ -617,7 +604,7 @@ services:
     arguments: ['@module_handler']
   date:
     class: Drupal\Core\Datetime\Date
-    arguments: ['@entity.manager', '@language_manager', '@string_translation']
+    arguments: ['@entity.manager', '@language_manager', '@string_translation', '@config.factory']
   feed.bridge.reader:
     class: Drupal\Component\Bridge\ZfExtensionManagerSfContainer
     calls:
diff --git a/core/includes/config.inc b/core/includes/config.inc
index c7fca03..e4fb08f 100644
--- a/core/includes/config.inc
+++ b/core/includes/config.inc
@@ -3,12 +3,14 @@
 use Drupal\Component\Utility\Unicode;
 use Drupal\Core\Config\Config;
 use Drupal\Core\Config\ConfigException;
+use Drupal\Core\Language\Language;
 use Drupal\Core\Config\ExtensionInstallStorage;
 use Drupal\Core\Config\Context\FreeConfigContext;
 use Drupal\Core\Config\FileStorage;
 use Drupal\Core\Config\StorageInterface;
 use Drupal\Core\Entity\EntityTypeInterface;
 use Symfony\Component\Yaml\Dumper;
+use Symfony\Component\EventDispatcher\EventDispatcher;
 
 /**
  * @file
@@ -66,17 +68,18 @@ function ($value) use ($name) {
   if (!empty($config_to_install)) {
     $entity_manager = Drupal::service('entity.manager');
     $config_factory = Drupal::service('config.factory');
-    $context = new FreeConfigContext(Drupal::service('event_dispatcher'), Drupal::service('uuid'));
     $target_storage = Drupal::service('config.storage');
     $typed_config = Drupal::service('config.typed');
-    $config_factory->enterContext($context);
+    $event_dispatcher = Drupal::service('event_dispatcher');
+
+    $config_factory->disableOverrides();
     foreach ($config_to_install as $name) {
       // Only import new config.
       if ($target_storage->exists($name)) {
         continue;
       }
 
-      $new_config = new Config($name, $target_storage, $context, $typed_config);
+      $new_config = new Config($name, $target_storage, $event_dispatcher, $typed_config);
       $data = $source_storage->read($name);
       if ($data !== FALSE) {
         $new_config->setData($data);
@@ -90,11 +93,8 @@ function ($value) use ($name) {
       else {
         $new_config->save();
       }
-
-      // Reset static cache on the config factory.
-      $config_factory->reset($name);
+      $config_factory->enableOverrides();
     }
-    $config_factory->leaveContext();
   }
 }
 
@@ -146,54 +146,6 @@ function config($name) {
 }
 
 /**
- * Sets the config context on the config factory.
- *
- * This allows configuration objects to be created using special configuration
- * contexts eg. global override free or locale using a user preferred language.
- * Calling this function affects all subsequent calls to \Drupal::config() until
- * config_context_leave() is called.
- *
- * @see config_context_leave()
- * @see \Drupal\Core\Config\ConfigFactory
- *
- * @param string $context_name
- *   The name of the config context service on the container or a fully
- *   qualified class implementing \Drupal\Core\Config\Context\ContextInterface.
- *
- * @return \Drupal\Core\Config\Context\ContextInterface
- *   The configuration context object.
- */
-function config_context_enter($context_name) {
-  $container = \Drupal::getContainer();
-  if ($container->has($context_name)) {
-    $context = $container->get($context_name);
-  }
-  elseif (class_exists($context_name) && in_array('Drupal\Core\Config\Context\ContextInterface', class_implements($context_name))) {
-    $context = $container
-      ->get('config.context.factory')
-      ->get($context_name);
-  }
-  else {
-    throw new ConfigException(sprintf('Unknown config context service or class: %s', $context_name));
-  }
-  $container
-    ->get('config.factory')
-    ->enterContext($context);
-  return $context;
-}
-
-/**
- * Leaves the current config context returning to the previous context.
- *
- * @see config_context_enter()
- * @see \Drupal\Core\Config\ConfigFactory
- */
-function config_context_leave() {
-  \Drupal::service('config.factory')
-    ->leaveContext();
-}
-
-/**
  * Returns the entity type of a configuration object.
  *
  * @param string $name
diff --git a/core/includes/install.core.inc b/core/includes/install.core.inc
index e6a5338..46fbcbc 100644
--- a/core/includes/install.core.inc
+++ b/core/includes/install.core.inc
@@ -378,13 +378,6 @@ function install_begin_request(&$install_state) {
     $container->register('event_dispatcher', 'Symfony\Component\EventDispatcher\EventDispatcher');
 
     $container->register('config.storage', 'Drupal\Core\Config\InstallStorage');
-    $container->register('config.context.factory', 'Drupal\Core\Config\Context\ConfigContextFactory')
-      ->addArgument(new Reference('event_dispatcher'))
-      ->addArgument(new Reference('uuid'));
-
-    $container->register('config.context', 'Drupal\Core\Config\Context\ContextInterface')
-      ->setFactoryService(new Reference('config.context.factory'))
-      ->setFactoryMethod('get');
 
     $container->register('config.storage.schema', 'Drupal\Core\Config\Schema\SchemaStorage');
 
@@ -395,7 +388,7 @@ function install_begin_request(&$install_state) {
 
     $container->register('config.factory', 'Drupal\Core\Config\ConfigFactory')
       ->addArgument(new Reference('config.storage'))
-      ->addArgument(new Reference('config.context'))
+      ->addArgument(new Reference('event_dispatcher'))
       ->addArgument(new Reference('config.typed'));
 
     // Register the 'language_manager' service.
diff --git a/core/includes/menu.inc b/core/includes/menu.inc
index 856c424..b0a14cb 100644
--- a/core/includes/menu.inc
+++ b/core/includes/menu.inc
@@ -2563,7 +2563,7 @@ function menu_router_rebuild() {
 function menu_router_build($save = FALSE) {
   // Ensure that all configuration used to build the menu items are loaded
   // without overrides.
-  config_context_enter('config.context.free');
+  \Drupal::configFactory()->disableOverrides();
   // We need to manually call each module so that we can know which module
   // a given item came from.
   $callbacks = array();
@@ -2578,8 +2578,8 @@ function menu_router_build($save = FALSE) {
   }
   // Alter the menu as defined in modules, keys are like user/%user.
   drupal_alter('menu', $callbacks);
-  // Return to the original context before menu building.
-  config_context_leave();
+  // Re-enable configuration overrides.
+  \Drupal::configFactory()->enableOverrides();
   foreach ($callbacks as $path => $router_item) {
     // If the menu item is a default local task and incorrectly references a
     // route, remove it.
diff --git a/core/lib/Drupal.php b/core/lib/Drupal.php
index 9c14801..6af2411 100644
--- a/core/lib/Drupal.php
+++ b/core/lib/Drupal.php
@@ -242,6 +242,19 @@ public static function config($name) {
   }
 
   /**
+   * Retrieves the configuration factory.
+   *
+   * This is mostly used to change the override settings on the configuration
+   * factory. For example, changing the language, or turning all overrides on
+   * or off.
+   *
+   * @return \Drupal\Core\Config\ConfigFactory
+   */
+  public static function configFactory() {
+    return static::$container->get('config.factory');
+  }
+
+  /**
    * Returns a queue for the given queue name.
    *
    * The following values can be set in your settings.php file's $settings
diff --git a/core/lib/Drupal/Core/Config/Config.php b/core/lib/Drupal/Core/Config/Config.php
index e026717..38761ac 100644
--- a/core/lib/Drupal/Core/Config/Config.php
+++ b/core/lib/Drupal/Core/Config/Config.php
@@ -10,11 +10,12 @@
 use Drupal\Component\Utility\NestedArray;
 use Drupal\Component\Utility\String;
 use Drupal\Core\Config\ConfigNameException;
-use Drupal\Core\Config\Context\ContextInterface;
 use Drupal\Core\Config\Schema\SchemaIncompleteException;
 use Drupal\Core\TypedData\PrimitiveInterface;
 use Drupal\Core\TypedData\Type\FloatInterface;
 use Drupal\Core\TypedData\Type\IntegerInterface;
+use Drupal\Core\Language\Language;
+use Symfony\Component\EventDispatcher\EventDispatcher;
 
 /**
  * Defines the default configuration object.
@@ -34,6 +35,20 @@ class Config {
   const MAX_NAME_LENGTH = 250;
 
   /**
+   * An event dispatcher instance to use for configuration events.
+   *
+   * @var \Symfony\Component\EventDispatcher\EventDispatcher
+   */
+  protected $eventDispatcher;
+
+  /**
+   * The language object used to override configuration data.
+   *
+   * @var Drupal\Core\Language\Language
+   */
+  protected $language;
+
+  /**
    * The name of the configuration object.
    *
    * @var string
@@ -55,25 +70,35 @@ class Config {
   protected $data;
 
   /**
-   * The current runtime data ($data + $overrides from Config Context).
+   * The current runtime data.
+   *
+   * The configuration data from storage merged with language, module and
+   * settings overrides.
    *
    * @var array
    */
   protected $overriddenData;
 
   /**
-   * The storage used to load and save this configuration object.
+   * The current language overrides.
    *
-   * @var \Drupal\Core\Config\StorageInterface
+   * @var array
    */
-  protected $storage;
+  protected $languageOverrides;
 
   /**
-   * The configuration context used for this configuration object.
+   * The current module overrides.
    *
-   * @var \Drupal\Core\Config\Context\ContextInterface
+   * @var array
    */
-  protected $context;
+  protected $moduleOverrides;
+
+  /**
+   * The storage used to load and save this configuration object.
+   *
+   * @var \Drupal\Core\Config\StorageInterface
+   */
+  protected $storage;
 
   /**
    * Whether the configuration object has already been loaded.
@@ -104,28 +129,19 @@ class Config {
    * @param \Drupal\Core\Config\StorageInterface $storage
    *   A storage controller object to use for reading and writing the
    *   configuration data.
-   * @param \Drupal\Core\Config\Context\ContextInterface $context
-   *   The configuration context used for this configuration object.
+   * @param \Symfony\Component\EventDispatcher\EventDispatcher $event_dispatcher
+   *   An event dispatcher instance to use for configuration events.
    * @param \Drupal\Core\Config\TypedConfigManager $typed_config
    *   The typed configuration manager service.
+   * @param \Drupal\Core\Language\Language $language
+   *   The language object used to override configuration data.
    */
-  public function __construct($name, StorageInterface $storage, ContextInterface $context, TypedConfigManager $typed_config) {
+  public function __construct($name, StorageInterface $storage, EventDispatcher $event_dispatcher, TypedConfigManager $typed_config, Language $language = NULL) {
     $this->name = $name;
     $this->storage = $storage;
-    $this->context = $context;
+    $this->eventDispatcher = $event_dispatcher;
     $this->typedConfigManager = $typed_config;
-  }
-
-  /**
-   * Initializes a configuration object.
-   *
-   * @return \Drupal\Core\Config\Config
-   *   The configuration object.
-   */
-  public function init() {
-    $this->isLoaded = FALSE;
-    $this->notify('init');
-    return $this;
+    $this->language = $language;
   }
 
   /**
@@ -139,10 +155,11 @@ public function init() {
    */
   public function initWithData(array $data) {
     $this->isLoaded = TRUE;
+    $this->settingsOverrides = array();
+    $this->languageOverrides = array();
+    $this->moduleOverrides = array();
     $this->isNew = FALSE;
-    $this->notify('init');
     $this->replaceData($data);
-    $this->notify('load');
     return $this;
   }
 
@@ -295,7 +312,7 @@ protected function replaceData(array $data) {
   }
 
   /**
-   * Sets overridden data for this configuration object.
+   * Sets settings.php overrides for this configuration object.
    *
    * The overridden data only applies to this configuration object.
    *
@@ -305,8 +322,38 @@ protected function replaceData(array $data) {
    * @return \Drupal\Core\Config\Config
    *   The configuration object.
    */
-  public function setOverride(array $data) {
-    $this->context->setOverrides($this->getName(), $data);
+  public function setSettingsOverride(array $data) {
+    $this->settingsOverrides = $data;
+    $this->resetOverriddenData();
+    return $this;
+  }
+
+  /**
+   * Sets module overrides for this configuration object.
+   *
+   * @param array $data
+   *   The overridden values of the configuration data.
+   *
+   * @return \Drupal\Core\Config\Config
+   *   The configuration object.
+   */
+  public function setModuleOverride(array $data) {
+    $this->moduleOverrides = $data;
+    $this->resetOverriddenData();
+    return $this;
+  }
+
+  /**
+   * Sets language overrides for this configuration object.
+   *
+   * @param array $data
+   *   The overridden values of the configuration data.
+   *
+   * @return \Drupal\Core\Config\Config
+   *   The configuration object.
+   */
+  public function setLanguageOverride(array $data) {
+    $this->languageOverrides = $data;
     $this->resetOverriddenData();
     return $this;
   }
@@ -314,16 +361,24 @@ public function setOverride(array $data) {
   /**
    * Sets the current data for this configuration object.
    *
-   * Merges overridden configuration data into the original data.
+   * Configuration overrides operate at three distinct layers: language, modules
+   * and settings.php, with the last of these taking precedence. Overrides in
+   * settings.php take precedence over values provided by modules. Overrides
+   * provided by modules take precedence over language.
    *
    * @return \Drupal\Core\Config\Config
    *   The configuration object.
    */
   protected function setOverriddenData() {
     $this->overriddenData = $this->data;
-    $overrides = $this->context->getOverrides($this->getName());
-    if (is_array($overrides)) {
-      $this->overriddenData = NestedArray::mergeDeepArray(array($this->overriddenData, $overrides), TRUE);
+    if (isset($this->languageOverrides) && is_array($this->languageOverrides)) {
+      $this->overriddenData = NestedArray::mergeDeepArray(array($this->overriddenData, $this->languageOverrides), TRUE);
+    }
+    if (isset($this->moduleOverrides) && is_array($this->moduleOverrides)) {
+      $this->overriddenData = NestedArray::mergeDeepArray(array($this->overriddenData, $this->moduleOverrides), TRUE);
+    }
+    if (isset($this->settingsOverrides) && is_array($this->settingsOverrides)) {
+      $this->overriddenData = NestedArray::mergeDeepArray(array($this->overriddenData, $this->settingsOverrides), TRUE);
     }
     return $this;
   }
@@ -412,7 +467,6 @@ public function load() {
       $this->isNew = FALSE;
       $this->replaceData($data);
     }
-    $this->notify('load');
     $this->isLoaded = TRUE;
     return $this;
   }
@@ -479,7 +533,7 @@ public function getStorage() {
    *   The configuration event name.
    */
   protected function notify($config_event_name) {
-    $this->context->notify($config_event_name, $this);
+    $this->eventDispatcher->dispatch('config.' . $config_event_name, new ConfigEvent($this));
   }
 
   /**
@@ -574,4 +628,14 @@ protected function castValue($key, $value) {
     return $value;
   }
 
+  /**
+   * Returns the language object for this Config object.
+   *
+   * @return \Drupal\Core\Language\Language
+   */
+  public function getLanguage() {
+    return $this->language;
+  }
+
 }
+
diff --git a/core/lib/Drupal/Core/Config/ConfigEvent.php b/core/lib/Drupal/Core/Config/ConfigEvent.php
index 4cfac2e..5b07098 100644
--- a/core/lib/Drupal/Core/Config/ConfigEvent.php
+++ b/core/lib/Drupal/Core/Config/ConfigEvent.php
@@ -2,7 +2,6 @@
 
 namespace Drupal\Core\Config;
 
-use Drupal\Core\Config\Context\ContextInterface;
 use Symfony\Component\EventDispatcher\Event;
 
 class ConfigEvent extends Event {
@@ -15,23 +14,13 @@ class ConfigEvent extends Event {
   protected $config;
 
   /**
-   * Configuration context object.
-   *
-   * @var \Drupal\Core\Config\Context\ContextInterface
-   */
-  protected $context;
-
-  /**
    * Constructs a configuration event object.
    *
-   * @param \Drupal\Core\Config\Context\ContextInterface
-   *   Configuration context object.
    * @param \Drupal\Core\Config\Config
-   *   (optional) Configuration object.
+   *   Configuration object.
    */
-  public function __construct(ContextInterface $context, Config $config = NULL) {
+  public function __construct(Config $config) {
     $this->config = $config;
-    $this->context = $context;
   }
 
   /**
@@ -40,14 +29,5 @@ public function __construct(ContextInterface $context, Config $config = NULL) {
   public function getConfig() {
     return $this->config;
   }
-
-  /**
-   * Gets configuration context object.
-   *
-   * @return \Drupal\Core\Config\Context\ContextInterface
-   *   Configuration context.
-   */
-  public function getContext() {
-    return $this->context;
-  }
 }
+
diff --git a/core/lib/Drupal/Core/Config/ConfigFactory.php b/core/lib/Drupal/Core/Config/ConfigFactory.php
index 7b1e97c..8a447fe 100644
--- a/core/lib/Drupal/Core/Config/ConfigFactory.php
+++ b/core/lib/Drupal/Core/Config/ConfigFactory.php
@@ -7,8 +7,9 @@
 
 namespace Drupal\Core\Config;
 
-use Drupal\Core\Config\Context\ContextInterface;
-use Drupal\Core\Config\TypedConfigManager;
+use Drupal\Core\Language\Language;
+use Symfony\Component\EventDispatcher\EventDispatcher;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 
 /**
  * Defines the configuration object factory.
@@ -22,14 +23,13 @@
  * is used for reading and writing the configuration data.
  *
  * @see \Drupal\Core\Config\StorageInterface
- *
- * A configuration context is an object containing parameters that will be
- * available to the configuration plug-ins for them to customize the
- * configuration data in different ways.
- *
- * @see \Drupal\Core\Config\Context\ContextInterface
  */
-class ConfigFactory {
+class ConfigFactory implements EventSubscriberInterface {
+
+  /**
+   * Prefix for all language configuration files.
+   */
+  const LANGUAGE_CONFIG_PREFIX = 'language.config';
 
   /**
    * A storage controller instance for reading and writing configuration data.
@@ -39,16 +39,30 @@ class ConfigFactory {
   protected $storage;
 
   /**
-   * A stack of configuration contexts the last being the context in use.
+   * An event dispatcher instance to use for configuration events.
    *
-   * @var array
+   * @var \Symfony\Component\EventDispatcher\EventDispatcher
    */
-  protected $contextStack = array();
+  protected $eventDispatcher;
+
+  /**
+   * A flag indicating if we should use overrides.
+   *
+   * @var boolean
+   */
+  protected $useOverrides = TRUE;
+
+  /**
+   * The language object used to override configuration data.
+   *
+   * @var \Drupal\Core\Language\Language
+   */
+  protected $language;
 
   /**
    * Cached configuration objects.
    *
-   * @var array
+   * @var \Drupal\Core\Config\Config[]
    */
   protected $cache = array();
 
@@ -64,19 +78,38 @@ class ConfigFactory {
    *
    * @param \Drupal\Core\Config\StorageInterface $storage
    *   The configuration storage engine.
-   * @param \Drupal\Core\Config\Context\ContextInterface $context
-   *   Configuration context object.
+   * @param \Symfony\Component\EventDispatcher\EventDispatcher $event_dispatcher
+   *   An event dispatcher instance to use for configuration events.
    * @param \Drupal\Core\Config\TypedConfigManager $typed_config
    *   The typed configuration manager.
+   * @param \Drupal\Core\Language\Language
+   *   (optional) The language for this configuration. The config factory will
+   *   use it to override configuration data if language overrides are
+   *   available.
    */
-  public function __construct(StorageInterface $storage, ContextInterface $context, TypedConfigManager $typed_config) {
+  public function __construct(StorageInterface $storage, EventDispatcher $event_dispatcher, TypedConfigManager $typed_config, Language $language = NULL) {
     $this->storage = $storage;
+    $this->eventDispatcher = $event_dispatcher;
     $this->typedConfigManager = $typed_config;
-    $this->enterContext($context);
+    $this->language = $language;
   }
 
   /**
-   * Returns a configuration object for a given name and context.
+   * Disable overrides when loading configuration objects.
+   */
+  public function disableOverrides() {
+    $this->useOverrides = FALSE;
+  }
+
+  /**
+   * Enable overrides when loading configuration objects.
+   */
+  public function enableOverrides() {
+    $this->useOverrides = TRUE;
+  }
+
+  /**
+   * Returns a configuration object for a given name.
    *
    * @param string $name
    *   The name of the configuration object to construct.
@@ -85,18 +118,51 @@ public function __construct(StorageInterface $storage, ContextInterface $context
    *   A configuration object.
    */
   public function get($name) {
-    $context = $this->getContext();
-    $cache_key = $this->getCacheKey($name, $context);
-    if (isset($this->cache[$cache_key])) {
-      return $this->cache[$cache_key];
+    global $conf;
+
+    if ($config = $this->loadMultiple(array($name))) {
+      return $config[$name];
     }
+    else {
+      $cache_key = $this->getCacheKey($name);
+      // If the config object has been deleted it will already exist in the
+      // cache but self::loadMultiple does not return such objects.
+      // @todo Explore making ConfigFactory a listener to the config.delete
+      //   event to reset the static cache when this occurs.
+      if (!isset($this->cache[$cache_key])) {
+        // If the configuration object does not exist in the configuration
+        // storage or static cache create a new object and add it to the static
+        // cache.
+        $this->cache[$cache_key] = new Config($name, $this->storage, $this->eventDispatcher, $this->typedConfigManager, $this->language);
 
-    $this->cache[$cache_key] = new Config($name, $this->storage, $context, $this->typedConfigManager);
-    return $this->cache[$cache_key]->init();
+        if ($this->canOverride($name)) {
+          // Get and apply any language overrides.
+          if ($this->language) {
+            $language_overrides = $this->storage->read($this->getLanguageConfigName($this->language->id, $name));
+          }
+          else {
+            $language_overrides = FALSE;
+          }
+          if (is_array($language_overrides)) {
+            $this->cache[$cache_key]->setLanguageOverride($language_overrides);
+          }
+          // Get and apply any module overrides.
+          $module_overrides = $this->loadModuleOverrides(array($name));
+          if (isset($module_overrides[$name])) {
+            $this->cache[$cache_key]->setModuleOverride($module_overrides[$name]);
+          }
+          // Apply any settings.php overrides.
+          if (isset($conf[$name])) {
+            $this->cache[$cache_key]->setSettingsOverride($conf[$name]);
+          }
+        }
+      }
+      return $this->cache[$cache_key];
+    }
   }
 
   /**
-   * Returns a list of configuration objects for a given names and context.
+   * Returns a list of configuration objects for the given names.
    *
    * This will pre-load all requested configuration objects does not create
    * new configuration objects.
@@ -108,13 +174,14 @@ public function get($name) {
    *   List of successfully loaded configuration objects, keyed by name.
    */
   public function loadMultiple(array $names) {
-    $context = $this->getContext();
+    global $conf;
 
     $list = array();
+
     foreach ($names as $key => $name) {
-      $cache_key = $this->getCacheKey($name, $context);
       // @todo: Deleted configuration stays in $this->cache, only return
-      //   config entities that are not new.
+      //   configuration objects that are not new.
+      $cache_key = $this->getCacheKey($name);
       if (isset($this->cache[$cache_key]) && !$this->cache[$cache_key]->isNew()) {
         $list[$name] = $this->cache[$cache_key];
         unset($names[$key]);
@@ -123,18 +190,70 @@ public function loadMultiple(array $names) {
 
     // Pre-load remaining configuration files.
     if (!empty($names)) {
-      $storage_data = $this->storage->readMultiple($names);
+      // Initialise override information.
+      $module_overrides = array();
+      $language_names = array();
+
+      if ($this->useOverrides) {
+        // In order to make just one call to storage, add in language names.
+        // Keep track of them separately, so we can get language override data
+        // returned from storage and set it on new Config objects.
+        $language_names = $this->getLanguageConfigNames($names);
+      }
+
+      $storage_data = $this->storage->readMultiple(array_merge($names, array_values($language_names)));
+
+      if ($this->useOverrides && !empty($storage_data)) {
+        // Only fire module override event if we have configuration to override.
+        $module_overrides = $this->loadModuleOverrides($names);
+      }
+
       foreach ($storage_data as $name => $data) {
-        $cache_key = $this->getCacheKey($name, $context);
-        $this->cache[$cache_key] = new Config($name, $this->storage, $context, $this->typedConfigManager);
+        if (in_array($name, $language_names)) {
+          // Language override configuration is used to override other
+          // configuration. Therefore, when it has been added to the
+          // $storage_data it is not statically cached in the config factory or
+          // overridden in any way.
+          continue;
+        }
+        $cache_key = $this->getCacheKey($name);
+
+        $this->cache[$cache_key] = new Config($name, $this->storage, $this->eventDispatcher, $this->typedConfigManager, $this->language);
         $this->cache[$cache_key]->initWithData($data);
+        if ($this->canOverride($name)) {
+          if (isset($language_names[$name]) && isset($storage_data[$language_names[$name]])) {
+            $this->cache[$cache_key]->setLanguageOverride($storage_data[$language_names[$name]]);
+          }
+          if (isset($module_overrides[$name])) {
+            $this->cache[$cache_key]->setModuleOverride($module_overrides[$name]);
+          }
+          if (isset($conf[$name])) {
+            $this->cache[$cache_key]->setSettingsOverride($conf[$name]);
+          }
+        }
         $list[$name] = $this->cache[$cache_key];
       }
     }
+
     return $list;
   }
 
   /**
+   * Get arbitrary overrides for the named configuration objects from modules.
+   *
+   * @param array $names
+   *   The names of the configuration objects to get overrides for.
+   *
+   * @return array
+   *   An array of overrides keyed by the configuration object name.
+   */
+  protected function loadModuleOverrides(array $names) {
+    $configOverridesEvent = new ConfigModuleOverridesEvent($names, $this->language);
+    $this->eventDispatcher->dispatch('config.module.overrides', $configOverridesEvent);
+    return $configOverridesEvent->getOverrides();
+  }
+
+  /**
    * Resets and re-initializes configuration objects. Internal use only.
    *
    * @param string $name
@@ -146,7 +265,7 @@ public function loadMultiple(array $names) {
    */
   public function reset($name = NULL) {
     if ($name) {
-      // Clear the cached configuration object in all contexts.
+      // Clear all cached configuration for this name.
       foreach ($this->getCacheKeys($name) as $cache_key) {
         unset($this->cache[$cache_key]);
       }
@@ -174,103 +293,171 @@ public function reset($name = NULL) {
    *   The renamed config object.
    */
   public function rename($old_name, $new_name) {
-    $context = $this->getContext();
-    $old_cache_key = $this->getCacheKey($old_name, $context);
-    $new_cache_key = $this->getCacheKey($new_name, $context);
+    $this->storage->rename($old_name, $new_name);
+    $old_cache_key = $this->getCacheKey($old_name);
     if (isset($this->cache[$old_cache_key])) {
-      $config = $this->cache[$old_cache_key];
       unset($this->cache[$old_cache_key]);
     }
-    else {
-      // Create the config object if it's not yet loaded into the static cache.
-      $config = new Config($old_name, $this->storage, $context, $this->typedConfigManager);
+
+    $new_cache_key = $this->getCacheKey($new_name);
+    $this->cache[$new_cache_key] = new Config($new_name, $this->storage, $this->eventDispatcher, $this->typedConfigManager, $this->language);
+    $this->cache[$new_cache_key]->load();
+    return $this->cache[$new_cache_key];
+  }
+
+  /**
+   * Gets the cache key for a given config name.
+   *
+   * @param string $name
+   *   The name of the configuration object.
+   *
+   * @return string
+   *   The cache key.
+   */
+  public function getCacheKey($name) {
+    $can_override = $this->canOverride($name);
+    $cache_key = $name . ':' . ($can_override ? 'overrides' : 'raw');
+
+    if ($can_override && isset($this->language)) {
+      $cache_key =  $cache_key . ':' . $this->language->id;
     }
+    return $cache_key;
+  }
 
-    $this->cache[$new_cache_key] = $config;
-    $this->storage->rename($old_name, $new_name);
-    return $this->cache[$new_cache_key]->setName($new_name)->init();
+  /**
+   * Gets all the cache keys that match the provided config name.
+   *
+   * @param string $name
+   *   The name of the configuration object.
+   *
+   * @return array
+   *   An array of cache keys that match the provided config name.
+   */
+  public function getCacheKeys($name) {
+    return array_filter(array_keys($this->cache), function($key) use ($name) {
+      // Return TRUE if the key starts with the configuration name.
+      return strpos($key, $name) === 0;
+    });
   }
 
   /**
-   * Sets the config context by adding it to the context stack.
+   * Clears the config factory static cache.
    *
-   * @param \Drupal\Core\Config\Context\ContextInterface $context
-   *   The configuration context to add.
+   * @return \Drupal\Core\Config\ConfigFactory
+   *   The config factory object.
+   */
+  public function clearStaticCache() {
+    $this->cache = array();
+    return $this;
+  }
+
+  /**
+   * Set the language to be used in configuration overrides.
+   *
+   * @param \Drupal\Core\Language\Language $language
+   *   The language object to be set on the config factory. Used to override
+   *   configuration by language.
    *
    * @return \Drupal\Core\Config\ConfigFactory
    *   The config factory object.
    */
-  public function enterContext(ContextInterface $context) {
-    // Initialize the context as it is being entered.
-    $this->contextStack[] = $context->init();
+  public function setLanguage(Language $language = NULL) {
+    $this->language = $language;
     return $this;
   }
 
   /**
-   * Gets the current config context.
+   * Gets the language Used to override configuration.
    *
-   * @return \Drupal\Core\Config\Context\ContextInterface $context
-   *   The current configuration context.
+   * @return \Drupal\Core\Language\Language
    */
-  public function getContext() {
-    return end($this->contextStack);
+  public function getLanguage() {
+    return $this->language;
   }
 
   /**
-   * Leaves the current context by removing it from the context stack.
+   * Gets configuration names for this language.
    *
-   * @return \Drupal\Core\Config\ConfigFactory
-   *   The config factory object.
+   * It will be the same name with a prefix depending on language code:
+   * language.config.LANGCODE.NAME
+   *
+   * @param array $names
+   *   A list of configuration object names.
+   *
+   * @return array
+   *   The localized config names, keyed by configuration object name.
    */
-  public function leaveContext() {
-    // Ensure at least one context is left on the stack. We already ensured
-    // there is at least one context set by taking the initial one in the
-    // constructor.
-    if (count($this->contextStack) > 1) {
-      array_pop($this->contextStack);
+  public function getLanguageConfigNames(array $names) {
+    $language_names = array();
+    if (isset($this->language)) {
+      foreach ($names as $name) {
+        if ($language_name = $this->getLanguageConfigName($this->language->id, $name)) {
+          $language_names[$name] = $language_name;
+        }
+      }
     }
-    return $this;
+    return $language_names;
   }
 
   /**
-   * Gets the cache key for a given config name in a particular context.
+   * Gets configuration name for the provided language.
    *
+   * The name will be the same name with a prefix depending on language code:
+   * language.config.LANGCODE.NAME
+   *
+   * @param string $langcode
+   *   The language code.
    * @param string $name
    *   The name of the configuration object.
-   * @param \Drupal\Core\Config\Context\ContextInterface $context
-   *   The configuration context.
    *
-   * @return string
-   *   The cache key.
+   * @return bool|string
+   *   The configuration name for configuration object providing overrides.
+   *   Returns false if the name already starts with the language config prefix.
    */
-  public function getCacheKey($name, ContextInterface $context) {
-    return $name . ':' . $context->getUuid();
+  public function getLanguageConfigName($langcode, $name) {
+    if (strpos($name, static::LANGUAGE_CONFIG_PREFIX) === 0) {
+      return FALSE;
+    }
+    return static::LANGUAGE_CONFIG_PREFIX . '.' . $langcode . '.' . $name;
   }
 
   /**
-   * Gets all the cache keys that match the provided config name.
+   * Determines if a particular configuration object can be overridden.
+   *
+   * Language override configuration should not be overridden.
    *
    * @param string $name
    *   The name of the configuration object.
    *
-   * @return array
-   *   An array of cache keys that match the provided config name.
+   * @return bool
+   *   TRUE if the configuration object can be overridden.
    */
-  public function getCacheKeys($name) {
-    $cache_keys = array_keys($this->cache);
-    return array_filter($cache_keys, function($key) use ($name) {
-      return ( strpos($key, $name) !== false );
-    });
+  protected function canOverride($name) {
+    return $this->useOverrides && !(strpos($name, static::LANGUAGE_CONFIG_PREFIX) === 0);
   }
 
   /**
-   * Clears the config factory static cache.
+   * Removes stale static cache entries when configuration is saved.
    *
-   * @return \Drupal\Core\Config\ConfigFactory
-   *   The config factory object.
+   * @param ConfigEvent $event
+   *   The configuration event.
    */
-  public function clearStaticCache() {
-    $this->cache = array();
-    return $this;
+  public function onConfigSave(ConfigEvent $event) {
+    // Clear out any other cache keys apart from the config object being saved.
+    $saved_config = $event->getConfig();
+    foreach ($this->getCacheKeys($saved_config->getName()) as $cache_key) {
+      if ($this->cache[$cache_key] != $saved_config) {
+        unset($this->cache[$cache_key]);
+      }
+    }
   }
+
+  /**
+   * {@inheritdoc}
+   */
+  static function getSubscribedEvents() {
+    $events['config.save'][] = array('onConfigSave', 255);
+    return $events;
+  }
+
 }
diff --git a/core/lib/Drupal/Core/Config/ConfigImporter.php b/core/lib/Drupal/Core/Config/ConfigImporter.php
index dd5b9bb..0feabdf 100644
--- a/core/lib/Drupal/Core/Config/ConfigImporter.php
+++ b/core/lib/Drupal/Core/Config/ConfigImporter.php
@@ -7,7 +7,6 @@
 
 namespace Drupal\Core\Config;
 
-use Drupal\Core\Config\Context\FreeConfigContext;
 use Drupal\Core\Config\TypedConfigManager;
 use Drupal\Core\Entity\EntityManagerInterface;
 use Drupal\Core\Lock\LockBackendInterface;
@@ -55,13 +54,6 @@ class ConfigImporter {
   protected $eventDispatcher;
 
   /**
-   * The configuration context.
-   *
-   * @var \Drupal\Core\Config\Context\ContextInterface
-   */
-  protected $context;
-
-  /**
    * The configuration factory.
    *
    * @var \Drupal\Core\Config\ConfigFactory
@@ -138,10 +130,6 @@ public function __construct(StorageComparerInterface $storage_comparer, EventDis
     $this->uuidService = $uuid_service;
     $this->typedConfigManager = $typed_config;
     $this->processed = $this->storageComparer->getEmptyChangelist();
-    // Use an override free context for importing so that overrides to do not
-    // pollute the imported data. The context is hard coded to ensure this is
-    // the case.
-    $this->context = new FreeConfigContext($this->eventDispatcher, $this->uuidService);
   }
 
   /**
@@ -235,7 +223,6 @@ public function import() {
       // Ensure that the changes have been validated.
       $this->validate();
 
-      $this->configFactory->enterContext($this->context);
       if (!$this->lock->acquire(static::ID)) {
         // Another process is synchronizing configuration.
         throw new ConfigImporterException(sprintf('%s is already importing', static::ID));
@@ -248,9 +235,6 @@ public function import() {
       // The import is now complete.
       $this->lock->release(static::ID);
       $this->reset();
-      // Leave the context used during import and clear the ConfigFactory's
-      // static cache.
-      $this->configFactory->leaveContext()->reset();
     }
     return $this;
   }
@@ -278,7 +262,7 @@ public function validate() {
   protected function importConfig() {
     foreach (array('delete', 'create', 'update') as $op) {
       foreach ($this->getUnprocessed($op) as $name) {
-        $config = new Config($name, $this->storageComparer->getTargetStorage(), $this->context, $this->typedConfigManager);
+        $config = new Config($name, $this->storageComparer->getTargetStorage(), $this->eventDispatcher, $this->typedConfigManager);
         if ($op == 'delete') {
           $config->delete();
         }
@@ -311,11 +295,11 @@ protected function importInvokeOwner() {
         // Validate the configuration object name before importing it.
         // Config::validateName($name);
         if ($entity_type = config_get_entity_type_by_name($name)) {
-          $old_config = new Config($name, $this->storageComparer->getTargetStorage(), $this->context, $this->typedConfigManager);
+          $old_config = new Config($name, $this->storageComparer->getTargetStorage(), $this->eventDispatcher, $this->typedConfigManager);
           $old_config->load();
 
           $data = $this->storageComparer->getSourceStorage()->read($name);
-          $new_config = new Config($name, $this->storageComparer->getTargetStorage(), $this->context, $this->typedConfigManager);
+          $new_config = new Config($name, $this->storageComparer->getTargetStorage(), $this->eventDispatcher, $this->typedConfigManager);
           if ($data !== FALSE) {
             $new_config->setData($data);
           }
diff --git a/core/lib/Drupal/Core/Config/ConfigModuleOverridesEvent.php b/core/lib/Drupal/Core/Config/ConfigModuleOverridesEvent.php
new file mode 100644
index 0000000..26692ea
--- /dev/null
+++ b/core/lib/Drupal/Core/Config/ConfigModuleOverridesEvent.php
@@ -0,0 +1,109 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Core\Config\ConfigModuleOverridesEvent.
+ */
+
+namespace Drupal\Core\Config;
+
+use Drupal\Component\Utility\NestedArray;
+use Drupal\Core\Language\Language;
+use Symfony\Component\EventDispatcher\Event;
+
+/**
+ * Event object to allow configuration to be overridden by modules.
+ */
+class ConfigModuleOverridesEvent extends Event {
+
+  /**
+   * Configuration names.
+   *
+   * @var array
+   */
+  protected $names;
+
+  /**
+   * Configuration overrides.
+   *
+   * @var array
+   */
+  protected $overrides;
+
+  /**
+   * The Language object used to override configuration data.
+   *
+   * @var \Drupal\Core\Language\Language
+   */
+  protected $language;
+
+  /**
+   * Constructs a configuration overrides event object.
+   *
+   * @param array $names
+   *   A list of configuration names.
+   * @param \Drupal\Core\Language\Language
+   *   (optional) The language for this configuration.
+   */
+  public function __construct(array $names, Language $language = NULL) {
+    $this->names = $names;
+    $this->language = $language;
+    $this->overrides = array();
+  }
+
+  /**
+   * Gets configuration names.
+   *
+   * @return array
+   *   The list of configuration names that can be overridden.
+   */
+  public function getNames() {
+    return $this->names;
+  }
+
+  /**
+   * Gets configuration language.
+   *
+   * @return \Drupal\Core\Language\Language
+   *   The configuration language object.
+   */
+  public function getLanguage() {
+    return $this->language;
+  }
+
+  /**
+   * Get configuration overrides.
+   *
+   * @return array.
+   *   The array of configuration overrides.
+   */
+  public function getOverrides() {
+    return $this->overrides;
+  }
+
+  /**
+   * Sets a configuration override for the given name.
+   *
+   * @param string $name
+   *   The configuration object name to override.
+   * @param array $values
+   *   The values in the configuration object to override.
+   *
+   * @return self
+   *   The ConfigModuleOverridesEvent object.
+   */
+  public function setOverride($name, array $values) {
+    if (in_array($name, $this->names)) {
+      if (isset($this->overrides[$name])) {
+        // Existing overrides take precedence since these will have been added
+        // by events with a higher priority.
+        $this->overrides[$name] = NestedArray::mergeDeepArray(array($values, $this->overrides[$name]), TRUE);
+      }
+      else {
+        $this->overrides[$name] = $values;
+      }
+    }
+    return $this;
+  }
+}
+
diff --git a/core/lib/Drupal/Core/Config/Context/ConfigContext.php b/core/lib/Drupal/Core/Config/Context/ConfigContext.php
deleted file mode 100644
index 128165b..0000000
--- a/core/lib/Drupal/Core/Config/Context/ConfigContext.php
+++ /dev/null
@@ -1,141 +0,0 @@
-<?php
-
-/**
- * @file
- * Contains \Drupal\Core\Config\Context\ConfigContext.
- */
-
-namespace Drupal\Core\Config\Context;
-
-use Drupal\Core\Config\Config;
-use Drupal\Core\Config\ConfigEvent;
-use Drupal\Component\Utility\NestedArray;
-use Drupal\Component\Uuid\UuidInterface;
-use Symfony\Component\EventDispatcher\EventDispatcher;
-
-/**
- * Defines the base configuration context object.
- *
- * A configuration context object provides a data array that can be used as
- * parameters to get customized configuration objects.
- */
-class ConfigContext implements ContextInterface {
-
-  /**
-   * The actual storage of key-value pairs.
-   *
-   * @var array
-   */
-  protected $data = array();
-
-  /**
-   * Any config overrides of key-value pairs.
-   *
-   * @var array
-   */
-  protected $overrides = array();
-
-  /**
-   * An event dispatcher instance to use for configuration events.
-   *
-   * @var \Symfony\Component\EventDispatcher\EventDispatcher
-   */
-  protected $eventDispatcher;
-
-  /**
-   * A unique identifier for the context.
-   *
-   * @var string
-   */
-  protected $uuid;
-
-  /**
-   * The UUID service.
-   *
-   * @var \Drupal\Component\Uuid\UuidInterface
-   */
-  protected $uuidService;
-
-  /**
-   * Constructs the configuration context.
-   *
-   * @param \Symfony\Component\EventDispatcher\EventDispatcher $event_dispatcher
-   *   An event dispatcher instance to use for configuration events.
-   * @param \Drupal\Component\Uuid\UuidInterface
-   *   The UUID service.
-   */
-  public function __construct(EventDispatcher $event_dispatcher, UuidInterface $uuid) {
-    $this->eventDispatcher = $event_dispatcher;
-    $this->uuidService = $uuid;
-  }
-
-  /**
-   * Implements \Drupal\Core\Config\Context\ContextInterface::init().
-   */
-  public function init() {
-    // Reset existing overrides and get a UUID for this context.
-    $this->overrides = array();
-    $this->setUuid();
-    // Notify event listeners that a configuration context has been created.
-    $this->notify('context', NULL);
-    return $this;
-  }
-
-  /**
-   * Implements \Drupal\Core\Config\Context\ContextInterface::get().
-   */
-  public function get($key) {
-    return array_key_exists($key, $this->data) ? $this->data[$key] : NULL;
-  }
-
-  /**
-   * Implements \Drupal\Core\Config\Context\ContextInterface::set().
-   */
-  public function set($key, $value) {
-    $this->data[$key] = $value;
-  }
-
-  /**
-   * Implements \Drupal\Core\Config\Context\ContextInterface::setUuid().
-   */
-  public function setUuid() {
-    $this->uuid = $this->uuidService->generate();
-  }
-
-  /**
-   * Implements \Drupal\Core\Config\Context\ContextInterface::getUuid().
-   */
-  public function getUuid() {
-    return $this->uuid;
-  }
-
-  /**
-   * Implements \Drupal\Core\Config\Context\ContextInterface::notify().
-   */
-  public function notify($config_event_name, Config $config = NULL) {
-    $this->eventDispatcher->dispatch('config.' . $config_event_name, new ConfigEvent($this, $config));
-  }
-
-  /**
-   * Implements \Drupal\Core\Config\Context\ContextInterface::setOverride().
-   */
-  public function setOverrides($config_name, $data) {
-    if (!isset($this->overrides[$config_name])) {
-      $this->overrides[$config_name] = $data;
-    }
-    else {
-      $this->overrides[$config_name] = NestedArray::mergeDeepArray(array($this->overrides[$config_name], $data), TRUE);
-    }
-  }
-
-  /**
-   * Implements \Drupal\Core\Config\Context\ContextInterface::getOverrides().
-   */
-  public function getOverrides($config_name) {
-    if (isset($this->overrides[$config_name])) {
-      return $this->overrides[$config_name];
-    }
-    return FALSE;
-  }
-
-}
diff --git a/core/lib/Drupal/Core/Config/Context/ConfigContextFactory.php b/core/lib/Drupal/Core/Config/Context/ConfigContextFactory.php
deleted file mode 100644
index de3fd7b..0000000
--- a/core/lib/Drupal/Core/Config/Context/ConfigContextFactory.php
+++ /dev/null
@@ -1,74 +0,0 @@
-<?php
-
-/**
- * @file
- * Contains \Drupal\Core\Config\Context\ConfigContextFactory.
- */
-
-namespace Drupal\Core\Config\Context;
-
-use Drupal\Core\Config\Config;
-use Drupal\Core\Config\ConfigException;
-use Drupal\Component\Uuid\UuidInterface;
-use Symfony\Component\EventDispatcher\EventDispatcher;
-
-/**
- * Defines configuration context factory.
- *
- * The configuration context factory creates configuration context objects.
- *
- * @see \Drupal\Core\Config\Context\ContextInterface
- */
-class ConfigContextFactory {
-
-  /**
-   * An event dispatcher instance to use for configuration events.
-   *
-   * @var \Symfony\Component\EventDispatcher\EventDispatcher
-   */
-  protected $eventDispatcher;
-
-  /**
-   * The UUID service.
-   *
-   * @var \Drupal\Component\Uuid\UuidInterface
-   */
-  protected $uuidService;
-
-  /**
-   * Constructs the configuration context.
-   *
-   * @param \Symfony\Component\EventDispatcher\EventDispatcher $event_dispatcher
-   *   An event dispatcher instance to use for configuration events.
-   * @param \Drupal\Component\Uuid\UuidInterface
-   *   The UUID service.
-   */
-  public function __construct(EventDispatcher $event_dispatcher, UuidInterface $uuid) {
-    $this->eventDispatcher = $event_dispatcher;
-    $this->uuidService = $uuid;
-  }
-
-  /**
-   * Returns a configuration context object.
-   *
-   * @param string $class
-   *   (Optional) The name of the configuration class to use. Defaults to
-   *   Drupal\Core\Config\Context\ConfigContext
-   *
-   * @return \Drupal\Core\Config\Context\ContextInterface $context
-   *   (Optional) The configuration context to use.
-   */
-  public function get($class = NULL) {
-    if (!$class) {
-      $class = 'Drupal\Core\Config\Context\ConfigContext';
-    }
-    if (class_exists($class)) {
-      $context = new $class($this->eventDispatcher, $this->uuidService);
-    }
-    else {
-      throw new ConfigException(sprintf('Unknown config context class: %s', $class));
-    }
-    return $context;
-  }
-
-}
diff --git a/core/lib/Drupal/Core/Config/Context/ContextInterface.php b/core/lib/Drupal/Core/Config/Context/ContextInterface.php
deleted file mode 100644
index e37d2d0..0000000
--- a/core/lib/Drupal/Core/Config/Context/ContextInterface.php
+++ /dev/null
@@ -1,101 +0,0 @@
-<?php
-
-/**
- * @file
- * Contains \Drupal\Core\Config\Context\ContextInterface.
- */
-
-namespace Drupal\Core\Config\Context;
-
-use Drupal\Core\Config\Config;
-
-/**
- * Defines the configuration context interface.
- *
- * The configuration context object will contain predefined parameters used
- * by the configuration object for storage operations and notifications
- * and contextual data to be used by configuration event listeners.
- *
- * @see \Drupal\Core\Config\Config
- * @see \Drupal\Core\Config\ConfigFactory
- * @see \Drupal::config()
- */
-interface ContextInterface {
-
-  /**
-   * Initializes a configuration context for use.
-   *
-   * @return \Drupal\Core\Config\Context\ConfigContext
-   *   The config context object.
-   */
-  public function init();
-
-  /**
-   * Returns the stored value for a given key.
-   *
-   * @param string $key
-   *   The key of the data to retrieve.
-   *
-   * @return mixed
-   *   The stored value, or NULL if no value exists.
-   */
-  public function get($key);
-
-  /**
-   * Saves a value for a given key.
-   *
-   * @param string $key
-   *   The key of the data to store.
-   * @param mixed $value
-   *   The data to store.
-   */
-  public function set($key, $value);
-
-  /**
-   * Sets the uuid for the context.
-   *
-   * @return string
-   *   The context's uuid.
-   */
-  public function setUuid();
-
-  /**
-   * Gets the uuid for the context.
-   *
-   * @return string
-   *   The context's uuid.
-   */
-  public function getUuid();
-
-  /**
-   * Dispatches a config event.
-   *
-   * @param string $config_event_name
-   *   Event name.
-   * @param \Drupal\Core\Config\Config $config
-   *   (optional) Configuration object.
-   */
-  public function notify($config_event_name, Config $config = NULL);
-
-  /**
-   * Sets the override data for a configuration object.
-   *
-   * @param string $config_name
-   *   Configuration name.
-   * @param array data
-   *   The override data.
-   */
-  public function setOverrides($config_name, $data);
-
-  /**
-   * Gets the override data for a configuration object.
-   *
-   * @param string $config_name
-   *   Configuration name.
-   *
-   * @return mixed
-   *   The override data or FALSE if there is none.
-   */
-  public function getOverrides($config_name);
-
-}
diff --git a/core/lib/Drupal/Core/Config/Context/FreeConfigContext.php b/core/lib/Drupal/Core/Config/Context/FreeConfigContext.php
deleted file mode 100644
index 4307f97..0000000
--- a/core/lib/Drupal/Core/Config/Context/FreeConfigContext.php
+++ /dev/null
@@ -1,30 +0,0 @@
-<?php
-
-/**
- * @file
- * Contains \Drupal\Core\Config\Context\FreeConfigContext.
- */
-
-namespace Drupal\Core\Config\Context;
-
-/**
- * Defines the override-free configuration context object.
- */
-class FreeConfigContext extends ConfigContext {
-
-  /**
-   * Implements \Drupal\Core\Config\Context\ContextInterface::getOverrides().
-   */
-  public function getOverrides($config_name) {
-    // Do nothing as this is override free.
-    return FALSE;
-  }
-
-  /**
-   * Implements \Drupal\Core\Config\Context\ContextInterface::setOverride().
-   */
-  public function setOverrides($config_name, $data) {
-    // Do nothing as this is override free.
-  }
-
-}
diff --git a/core/lib/Drupal/Core/Config/Context/LanguageConfigContext.php b/core/lib/Drupal/Core/Config/Context/LanguageConfigContext.php
deleted file mode 100644
index ab65df1..0000000
--- a/core/lib/Drupal/Core/Config/Context/LanguageConfigContext.php
+++ /dev/null
@@ -1,43 +0,0 @@
-<?php
-
-/**
- * @file
- * Contains \Drupal\Core\Config\Context\LanguageConfigContext.
- */
-
-namespace Drupal\Core\Config\Context;
-
-use Drupal\Core\Config\Context\ConfigContext;
-use Drupal\Core\Language\Language;
-
-/**
- * Defines a configuration context object for a language.
- *
- * This should be used when configuration objects need a context for a language
- * other than the current language.
- */
-class LanguageConfigContext extends ConfigContext {
-
-  /**
-   * Predefined key for language object.
-   */
-  const LANGUAGE_KEY = 'language';
-
-  /**
-   * Creates the configuration context for language.
-   *
-   * @param \Drupal\Core\Language\Language $language
-   *   The language object to add to the config context.
-   *
-   * @return \Drupal\Core\Language\Language
-   *   The config context language object.
-   */
-  public function setLanguage(Language $language) {
-    $this->set(self::LANGUAGE_KEY, $language);
-    // Re-initialize since the language change changes the context
-    // fundamentally.
-    $this->init();
-    return $this;
-  }
-
-}
diff --git a/core/lib/Drupal/Core/Config/Entity/ConfigStorageController.php b/core/lib/Drupal/Core/Config/Entity/ConfigStorageController.php
index 5570aef..809f186 100644
--- a/core/lib/Drupal/Core/Config/Entity/ConfigStorageController.php
+++ b/core/lib/Drupal/Core/Config/Entity/ConfigStorageController.php
@@ -362,7 +362,7 @@ public function save(EntityInterface $entity) {
       // - Storage controller needs to access the original object.
       // - The object needs to be renamed/copied in ConfigFactory and reloaded.
       // - All instances of the object need to be renamed.
-      $this->configFactory->rename($prefix . $id, $prefix . $entity->id());
+      $config = $this->configFactory->rename($prefix . $id, $prefix . $entity->id());
     }
 
     // Build an ID if none is set.
diff --git a/core/lib/Drupal/Core/Datetime/Date.php b/core/lib/Drupal/Core/Datetime/Date.php
index 0510fa4..34b8632 100644
--- a/core/lib/Drupal/Core/Datetime/Date.php
+++ b/core/lib/Drupal/Core/Datetime/Date.php
@@ -8,6 +8,7 @@
 namespace Drupal\Core\Datetime;
 
 use Drupal\Component\Utility\Xss;
+use Drupal\Core\Config\ConfigFactory;
 use Drupal\Core\Datetime\DrupalDateTime;
 use Drupal\Core\Entity\EntityManagerInterface;
 use Drupal\Core\Language\Language;
@@ -40,6 +41,13 @@ class Date {
    */
   protected $languageManager;
 
+  /**
+   * The configuration factory.
+   *
+   * @var \Drupal\Core\Config\ConfigFactory
+   */
+  protected $configFactory;
+
   protected $country = NULL;
   protected $dateFormats = array();
 
@@ -72,10 +80,11 @@ class Date {
    * @param \Drupal\Core\StringTranslation\TranslationInterface $translation
    *   The string translation.
    */
-  public function __construct(EntityManagerInterface $entity_manager, LanguageManager $language_manager, TranslationInterface $translation) {
+  public function __construct(EntityManagerInterface $entity_manager, LanguageManager $language_manager, TranslationInterface $translation, ConfigFactory $config_factory) {
     $this->dateFormatStorage = $entity_manager->getStorageController('date_format');
     $this->languageManager = $language_manager;
     $this->stringTranslation = $translation;
+    $this->configFactory = $config_factory;
   }
 
   /**
@@ -205,11 +214,10 @@ protected function t($string, array $args = array(), array $options = array()) {
   protected function dateFormat($format, $langcode) {
     if (!isset($this->dateFormats[$format][$langcode])) {
       // Enter a language specific context so the right date format is loaded.
-      $language_context = config_context_enter('Drupal\Core\Config\Context\LanguageConfigContext');
-      $language_context->setLanguage(new Language(array('id' => $langcode)));
-
+      $original_language = $this->configFactory->getLanguage();
+      $this->configFactory->setLanguage(new Language(array('id' => $langcode)));
       $this->dateFormats[$format][$langcode] = $this->dateFormatStorage->load($format);
-      config_context_leave();
+      $this->configFactory->setLanguage($original_language);
     }
     return $this->dateFormats[$format][$langcode];
   }
diff --git a/core/lib/Drupal/Core/Form/ConfigFormBase.php b/core/lib/Drupal/Core/Form/ConfigFormBase.php
index 5c69835..91a91d5 100644
--- a/core/lib/Drupal/Core/Form/ConfigFormBase.php
+++ b/core/lib/Drupal/Core/Form/ConfigFormBase.php
@@ -8,7 +8,6 @@
 namespace Drupal\Core\Form;
 
 use Drupal\Core\Config\ConfigFactory;
-use Drupal\Core\Config\Context\ContextInterface;
 use Drupal\Core\Form\FormBase;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
@@ -29,12 +28,9 @@
    *
    * @param \Drupal\Core\Config\ConfigFactory $config_factory
    *   The factory for configuration objects.
-   * @param \Drupal\Core\Config\Context\ContextInterface $context
-   *   The configuration context to use.
    */
-  public function __construct(ConfigFactory $config_factory, ContextInterface $context) {
+  public function __construct(ConfigFactory $config_factory) {
     $this->configFactory = $config_factory;
-    $this->configFactory->enterContext($context);
   }
 
   /**
@@ -42,8 +38,7 @@ public function __construct(ConfigFactory $config_factory, ContextInterface $con
    */
   public static function create(ContainerInterface $container) {
     return new static(
-      $container->get('config.factory'),
-      $container->get('config.context.free')
+      $container->get('config.factory')
     );
   }
 
@@ -73,13 +68,15 @@ public function submitForm(array &$form, array &$form_state) {
 
   /**
    * {@inheritdoc}
+   *
+   * Overrides \Drupal\Core\Form\FormBase::config() so that configuration is
+   * returned override free. This ensures that overrides do not pollute saved
+   * configuration.
    */
   protected function config($name) {
-    if (!$this->configFactory) {
-      $container = $this->container();
-      $this->configFactory = $container->get('config.factory');
-      $this->configFactory->enterContext($container->get('config.context.free'));
-    }
-    return $this->configFactory->get($name);
+    $this->configFactory->disableOverrides();
+    $config = $this->configFactory->get($name);
+    $this->configFactory->enableOverrides();
+    return $config;
   }
 }
diff --git a/core/lib/Drupal/Core/Language/LanguageManager.php b/core/lib/Drupal/Core/Language/LanguageManager.php
index e6526f2..a7dfbc0 100644
--- a/core/lib/Drupal/Core/Language/LanguageManager.php
+++ b/core/lib/Drupal/Core/Language/LanguageManager.php
@@ -236,7 +236,7 @@ protected function getLanguageTypes() {
    * @return \Drupal\Core\Language\Language
    *   A language object.
    */
-  protected function getLanguageDefault() {
+  public function getLanguageDefault() {
     $default_info = variable_get('language_default', array(
       'id' => 'en',
       'name' => 'English',
diff --git a/core/modules/aggregator/lib/Drupal/aggregator/Form/SettingsForm.php b/core/modules/aggregator/lib/Drupal/aggregator/Form/SettingsForm.php
index 1c59201..5fc015b 100644
--- a/core/modules/aggregator/lib/Drupal/aggregator/Form/SettingsForm.php
+++ b/core/modules/aggregator/lib/Drupal/aggregator/Form/SettingsForm.php
@@ -9,7 +9,6 @@
 
 use Drupal\aggregator\Plugin\AggregatorPluginManager;
 use Drupal\Component\Utility\String;
-use Drupal\Core\Config\Context\ContextInterface;
 use Drupal\Core\Config\ConfigFactory;
 use Drupal\Core\Plugin\PluginFormInterface;
 use Drupal\Core\StringTranslation\TranslationInterface;
@@ -51,8 +50,6 @@ class SettingsForm extends ConfigFormBase {
    *
    * @param \Drupal\Core\Config\ConfigFactory $config_factory
    *   The factory for configuration objects.
-   * @param \Drupal\Core\Config\Context\ContextInterface $context
-   *   The configuration context to use.
    * @param \Drupal\aggregator\Plugin\AggregatorPluginManager $fetcher_manager
    *   The aggregator fetcher plugin manager.
    * @param \Drupal\aggregator\Plugin\AggregatorPluginManager $parser_manager
@@ -62,8 +59,8 @@ class SettingsForm extends ConfigFormBase {
    * @param \Drupal\Core\StringTranslation\TranslationInterface $translation_manager
    *   The string translation manager.
    */
-  public function __construct(ConfigFactory $config_factory, ContextInterface $context, AggregatorPluginManager $fetcher_manager, AggregatorPluginManager $parser_manager, AggregatorPluginManager $processor_manager, TranslationInterface $translation_manager) {
-    parent::__construct($config_factory, $context);
+  public function __construct(ConfigFactory $config_factory, AggregatorPluginManager $fetcher_manager, AggregatorPluginManager $parser_manager, AggregatorPluginManager $processor_manager, TranslationInterface $translation_manager) {
+    parent::__construct($config_factory);
     $this->translationManager = $translation_manager;
     $this->managers = array(
       'fetcher' => $fetcher_manager,
@@ -84,7 +81,6 @@ public function __construct(ConfigFactory $config_factory, ContextInterface $con
   public static function create(ContainerInterface $container) {
     return new static(
       $container->get('config.factory'),
-      $container->get('config.context.free'),
       $container->get('plugin.manager.aggregator.fetcher'),
       $container->get('plugin.manager.aggregator.parser'),
       $container->get('plugin.manager.aggregator.processor'),
diff --git a/core/modules/aggregator/tests/Drupal/aggregator/Tests/Plugin/AggregatorPluginSettingsBaseTest.php b/core/modules/aggregator/tests/Drupal/aggregator/Tests/Plugin/AggregatorPluginSettingsBaseTest.php
index 9c120c3..139a5ba 100644
--- a/core/modules/aggregator/tests/Drupal/aggregator/Tests/Plugin/AggregatorPluginSettingsBaseTest.php
+++ b/core/modules/aggregator/tests/Drupal/aggregator/Tests/Plugin/AggregatorPluginSettingsBaseTest.php
@@ -67,7 +67,6 @@ public function setUp() {
 
     $this->settingsForm = new SettingsForm(
       $this->configFactory,
-      $this->getMock('Drupal\Core\Config\Context\ContextInterface'),
       $this->managers['fetcher'],
       $this->managers['parser'],
       $this->managers['processor'],
diff --git a/core/modules/book/lib/Drupal/book/Tests/BookTest.php b/core/modules/book/lib/Drupal/book/Tests/BookTest.php
index 93c5c78..21fc988 100644
--- a/core/modules/book/lib/Drupal/book/Tests/BookTest.php
+++ b/core/modules/book/lib/Drupal/book/Tests/BookTest.php
@@ -434,9 +434,9 @@ function testBookNodeTypeChange() {
     //   'page',
     // );
     // @endcode
-    $current_config = \Drupal::config('book.settings')->init()->get();
+    $current_config = \Drupal::config('book.settings')->get();
     $this->drupalPostForm('admin/structure/book/settings', array(), t('Save configuration'));
-    $this->assertIdentical($current_config, \Drupal::config('book.settings')->init()->get());
+    $this->assertIdentical($current_config, \Drupal::config('book.settings')->get());
 
     // Change the name, machine name and description.
     $edit = array(
@@ -455,9 +455,9 @@ function testBookNodeTypeChange() {
     //   'zebra',
     // );
     // @endcode
-    $current_config = \Drupal::config('book.settings')->init()->get();
+    $current_config = \Drupal::config('book.settings')->get();
     $this->drupalPostForm('admin/structure/book/settings', array(), t('Save configuration'));
-    $this->assertIdentical($current_config, \Drupal::config('book.settings')->init()->get());
+    $this->assertIdentical($current_config, \Drupal::config('book.settings')->get());
 
     $edit = array(
       'name' => 'Animal book',
@@ -473,9 +473,9 @@ function testBookNodeTypeChange() {
     //   'zebra',
     // );
     // @endcode
-    $current_config = \Drupal::config('book.settings')->init()->get();
+    $current_config = \Drupal::config('book.settings')->get();
     $this->drupalPostForm('admin/structure/book/settings', array(), t('Save configuration'));
-    $this->assertIdentical($current_config, \Drupal::config('book.settings')->init()->get());
+    $this->assertIdentical($current_config, \Drupal::config('book.settings')->get());
 
     // Ensure that after all the node type changes book.settings:child_type has
     // the expected value.
diff --git a/core/modules/config/lib/Drupal/config/Tests/ConfigExportImportUITest.php b/core/modules/config/lib/Drupal/config/Tests/ConfigExportImportUITest.php
index a214b63..9095b7d 100644
--- a/core/modules/config/lib/Drupal/config/Tests/ConfigExportImportUITest.php
+++ b/core/modules/config/lib/Drupal/config/Tests/ConfigExportImportUITest.php
@@ -48,11 +48,6 @@ class ConfigExportImportUITest extends WebTestBase {
    */
   protected $admin_role;
 
-  /**
-   * Sort methods alphabetically in order to allow for a predictable sequence.
-   */
-  const SORT_METHODS = TRUE;
-
   public static $modules = array('config');
 
   public static function getInfo() {
@@ -73,52 +68,31 @@ protected function setUp() {
   }
 
   /**
-   * Tests a simple site configuration export case: site slogan.
+   * Tests a simple site export import case.
    */
-  function testExport() {
-    $this->siteUuid = \Drupal::config('system.site')->get('uuid');
-
-    // Create a role for second round.
-    $this->admin_role = $this->drupalCreateRole(array('synchronize configuration', 'import configuration'));
-    $this->slogan = $this->randomString(16);
+  public function testExportImport() {
+    $this->originalSlogan = \Drupal::config('system.site')->get('slogan');
+    $this->newSlogan = $this->randomString(16);
+    $this->assertNotEqual($this->newSlogan, $this->originalSlogan);
     \Drupal::config('system.site')
-      ->set('slogan', $this->slogan)
+      ->set('slogan', $this->newSlogan)
       ->save();
+    $this->assertEqual(\Drupal::config('system.site')->get('slogan'), $this->newSlogan);
+
     $this->drupalPostForm('admin/config/development/configuration/full/export', array(), 'Export');
     $this->tarball = $this->drupalGetContent();
-  }
 
-  /**
-   * Tests importing the tarball to ensure changes made it over.
-   */
-  function testImport() {
-    $filename = 'temporary://' . $this->randomName();
-    file_put_contents($filename, $this->tarball);
-    $this->doImport($filename);
-    // Now that the role is imported, change the slogan and re-import with a non-root user.
-    $web_user = $this->drupalCreateUser();
-    $web_user->addRole($this->admin_role);
-    $web_user->save();
-    $this->drupalLogin($web_user);
     \Drupal::config('system.site')
-      ->set('slogan', $this->randomString(16))
+      ->set('slogan', $this->originalSlogan)
       ->save();
-    $this->doImport($filename);
-  }
-
-  /**
-   * Import a tarball and assert the data is correct.
-   *
-   * @param string $filename
-   *   The name of the tarball containing the configuration to be imported.
-   */
-  protected function doImport($filename) {
-    // The site UUIDs must match for the import to work.
-    \Drupal::config('system.site')->set('uuid', $this->siteUuid)->save();
+    $this->assertEqual(\Drupal::config('system.site')->get('slogan'), $this->originalSlogan);
 
-    $this->assertNotEqual($this->slogan, \Drupal::config('system.site')->get('slogan'));
+    $filename = 'temporary://' . $this->randomName();
+    file_put_contents($filename, $this->tarball);
     $this->drupalPostForm('admin/config/development/configuration/full/import', array('files[import_tarball]' => $filename), 'Upload');
     $this->drupalPostForm(NULL, array(), 'Import all');
-    $this->assertEqual($this->slogan, \Drupal::config('system.site')->get('slogan'));
+
+    $this->assertEqual(\Drupal::config('system.site')->get('slogan'), $this->newSlogan);
   }
 }
+
diff --git a/core/modules/config/lib/Drupal/config/Tests/ConfigImporterTest.php b/core/modules/config/lib/Drupal/config/Tests/ConfigImporterTest.php
index 6af6295..de7fc7f 100644
--- a/core/modules/config/lib/Drupal/config/Tests/ConfigImporterTest.php
+++ b/core/modules/config/lib/Drupal/config/Tests/ConfigImporterTest.php
@@ -62,7 +62,8 @@ function setUp() {
       $this->container->get('entity.manager'),
       $this->container->get('lock'),
       $this->container->get('uuid'),
-      $this->container->get('config.typed')
+      $this->container->get('config.typed'),
+      $this->container->get('module_handler')
     );
     $this->copyConfig($this->container->get('config.storage'), $this->container->get('config.storage.staging'));
   }
@@ -229,6 +230,7 @@ function testUpdated() {
     $this->configImporter->reset()->import();
 
     // Verify the values were updated.
+    \Drupal::configFactory()->reset($name);
     $config = \Drupal::config($name);
     $this->assertIdentical($config->get('foo'), 'beer');
     $config = \Drupal::config($dynamic_name);
diff --git a/core/modules/config/lib/Drupal/config/Tests/ConfigInstallTest.php b/core/modules/config/lib/Drupal/config/Tests/ConfigInstallTest.php
index 1062ea5..992c1bd 100644
--- a/core/modules/config/lib/Drupal/config/Tests/ConfigInstallTest.php
+++ b/core/modules/config/lib/Drupal/config/Tests/ConfigInstallTest.php
@@ -47,6 +47,8 @@ function testModuleInstallation() {
     $this->installConfig(array('config_test'));
 
     // Verify that default module config exists.
+    \Drupal::configFactory()->reset($default_config);
+    \Drupal::configFactory()->reset($default_configuration_entity);
     $config = \Drupal::config($default_config);
     $this->assertIdentical($config->isNew(), FALSE);
     $config = \Drupal::config($default_configuration_entity);
diff --git a/core/modules/config/lib/Drupal/config/Tests/ConfigInstallWebTest.php b/core/modules/config/lib/Drupal/config/Tests/ConfigInstallWebTest.php
index 3bb7839..0fd3f5e 100644
--- a/core/modules/config/lib/Drupal/config/Tests/ConfigInstallWebTest.php
+++ b/core/modules/config/lib/Drupal/config/Tests/ConfigInstallWebTest.php
@@ -49,6 +49,8 @@ function testIntegrationModuleReinstallation() {
     \Drupal::moduleHandler()->install(array('config_integration_test'));
 
     // Verify that default module config exists.
+    \Drupal::configFactory()->reset($default_config);
+    \Drupal::configFactory()->reset($default_configuration_entity);
     $config_static = \Drupal::config($default_config);
     $this->assertIdentical($config_static->isNew(), FALSE);
     $this->assertIdentical($config_static->get('foo'), 'default setting');
@@ -82,6 +84,8 @@ function testIntegrationModuleReinstallation() {
     \Drupal::moduleHandler()->install(array('config_integration_test'));
 
     // Verify the integration module's config was re-installed.
+    \Drupal::configFactory()->reset($default_config);
+    \Drupal::configFactory()->reset($default_configuration_entity);
     $config_static = \Drupal::config($default_config);
     $this->assertIdentical($config_static->isNew(), FALSE);
     $this->assertIdentical($config_static->get('foo'), 'default setting');
diff --git a/core/modules/config/lib/Drupal/config/Tests/ConfigLanguageOverride.php b/core/modules/config/lib/Drupal/config/Tests/ConfigLanguageOverride.php
new file mode 100644
index 0000000..e0cec21
--- /dev/null
+++ b/core/modules/config/lib/Drupal/config/Tests/ConfigLanguageOverride.php
@@ -0,0 +1,84 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\config\Tests\ConfigLanguageOverride.
+ */
+
+namespace Drupal\config\Tests;
+
+use Drupal\Core\Language\Language;
+use Drupal\simpletest\DrupalUnitTestBase;
+
+/**
+ * Tests language config override.
+ */
+class ConfigLanguageOverride extends DrupalUnitTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = array('config_test', 'user', 'language', 'system', 'field');
+
+  public static function getInfo() {
+    return array(
+      'name' => 'Language override',
+      'description' => 'Confirm that language overrides work',
+      'group' => 'Configuration',
+    );
+  }
+
+  public function setUp() {
+    parent::setUp();
+    config_install_default_config('module', 'config_test');
+    config_install_default_config('module', 'locale');
+    \Drupal::configFactory()->setLanguage(language_default());
+  }
+
+  /**
+   * Tests locale override based on language.
+   */
+  function testConfigLanguageOverride() {
+    $config = \Drupal::config('config_test.system');
+    $this->assertIdentical($config->get('foo'), 'en bar');
+
+    language_save(new Language(array(
+      'name' => 'French',
+      'id' => 'fr',
+    )));
+    language_save(new Language(array(
+      'name' => 'German',
+      'id' => 'de',
+    )));
+
+    \Drupal::configFactory()->setLanguage(language_load('fr'));
+    $config = \Drupal::config('config_test.system');
+    $this->assertIdentical($config->get('foo'), 'fr bar');
+
+    \Drupal::configFactory()->setLanguage(language_load('de'));
+    $config = \Drupal::config('config_test.system');
+    $this->assertIdentical($config->get('foo'), 'de bar');
+
+    // Test overrides of completely new configuration objects. In normal runtime
+    // this should only happen for configuration entities as we should not be
+    // creating simple configuration objects on the fly.
+    $language_config_name = \Drupal::configFactory()->getLanguageConfigName('de', 'config_test.new');
+    \Drupal::config($language_config_name)->set('language', 'override')->save();
+    \Drupal::config('config_test.new');
+    $config = \Drupal::config('config_test.new');
+    $this->assertTrue($config->isNew(), 'The configuration object config_test.new is new');
+    $this->assertIdentical($config->get('language'), 'override');
+    \Drupal::configFactory()->disableOverrides();
+    $config = \Drupal::config('config_test.new');
+    $this->assertIdentical($config->get('language'), NULL);
+    \Drupal::configFactory()->enableOverrides();
+
+    // Ensure that language configuration overrides can not be overridden.
+    global $conf;
+    $conf[$language_config_name]['language'] = 'conf cannot override';
+    $this->assertIdentical(\Drupal::config($language_config_name)->get('language'), 'override');
+  }
+}
+
diff --git a/core/modules/config/lib/Drupal/config/Tests/ConfigLocaleOverrideWebTest.php b/core/modules/config/lib/Drupal/config/Tests/ConfigLanguageOverrideWebTest.php
similarity index 77%
rename from core/modules/config/lib/Drupal/config/Tests/ConfigLocaleOverrideWebTest.php
rename to core/modules/config/lib/Drupal/config/Tests/ConfigLanguageOverrideWebTest.php
index f98a1e0..d8412b4 100644
--- a/core/modules/config/lib/Drupal/config/Tests/ConfigLocaleOverrideWebTest.php
+++ b/core/modules/config/lib/Drupal/config/Tests/ConfigLanguageOverrideWebTest.php
@@ -2,7 +2,7 @@
 
 /**
  * @file
- * Contains \Drupal\config\Tests\ConfigLocaleOverrideWebTest.
+ * Contains \Drupal\config\Tests\ConfigLanguageOverrideWebTest.
  */
 
 namespace Drupal\config\Tests;
@@ -12,14 +12,14 @@
 /**
  * Tests language overrides in configuration through the request.
  */
-class ConfigLocaleOverrideWebTest extends WebTestBase {
+class ConfigLanguageOverrideWebTest extends WebTestBase {
 
-  public static $modules = array('locale', 'language', 'system');
+  public static $modules = array('language', 'system');
 
   public static function getInfo() {
     return array(
-      'name' => 'Locale overrides through the request',
-      'description' => 'Tests locale overrides applied through the website.',
+      'name' => 'Language overrides through the request',
+      'description' => 'Tests language overrides applied through the website.',
       'group' => 'Configuration',
     );
   }
@@ -47,7 +47,8 @@ function testSiteNameTranslation() {
     $this->drupalPostForm('admin/config/regional/language/add', $edit, t('Add custom language'));
 
     // Save an override for the XX language.
-    \Drupal::config('locale.config.xx.system.site')->set('name', 'XX site name')->save();
+    $config_name = \Drupal::configFactory()->getLanguageConfigName('xx', 'system.site');
+    \Drupal::config($config_name)->set('name', 'XX site name')->save();
 
     $this->drupalLogout();
 
diff --git a/core/modules/config/lib/Drupal/config/Tests/ConfigLocaleOverride.php b/core/modules/config/lib/Drupal/config/Tests/ConfigLocaleOverride.php
deleted file mode 100644
index 24edb76..0000000
--- a/core/modules/config/lib/Drupal/config/Tests/ConfigLocaleOverride.php
+++ /dev/null
@@ -1,297 +0,0 @@
-<?php
-
-/**
- * @file
- * Contains \Drupal\config\Tests\ConfigLocaleOverride.
- */
-
-namespace Drupal\config\Tests;
-
-use Drupal\Core\Config\ConfigException;
-use Drupal\Core\Language\Language;
-use Drupal\simpletest\DrupalUnitTestBase;
-
-/**
- * Tests locale config override.
- */
-class ConfigLocaleOverride extends DrupalUnitTestBase {
-
-  /**
-   * Modules to enable.
-   *
-   * @var array
-   */
-  public static $modules = array('locale', 'config_test', 'user', 'language', 'system', 'field');
-
-  public static function getInfo() {
-    return array(
-      'name' => 'Locale override',
-      'description' => 'Confirm that locale overrides work',
-      'group' => 'Configuration',
-    );
-  }
-
-  public function setUp() {
-    parent::setUp();
-    config_install_default_config('module', 'config_test');
-    config_install_default_config('module', 'locale');
-  }
-
-  /**
-   * Tests basic locale override.
-   */
-  function testConfigLocaleOverride() {
-    $name = 'config_test.system';
-    // The default language is en so the config key should be localised.
-    $config = \Drupal::config($name);
-    $this->assertIdentical($config->get('foo'), 'en bar');
-    $this->assertIdentical($config->get('404'), 'herp');
-
-    // Ensure that we get the expected value when we avoid overrides.
-    config_context_enter('config.context.free');
-    $config_admin = \Drupal::config($name);
-    $this->assertIdentical($config_admin->get('foo'), 'bar');
-    $this->assertIdentical($config_admin->get('404'), 'herp');
-
-    // Leave the non override context.
-    config_context_leave();
-    $config = \Drupal::config($name);
-    $this->assertIdentical($config->get('foo'), 'en bar');
-    $this->assertIdentical($config->get('404'), 'herp');
-  }
-
-  /**
-   * Tests locale override based on user's preferred language.
-   */
-  function testConfigLocaleUserOverride() {
-    $this->installSchema('system', 'variable');
-    $this->installConfig(array('language'));
-    language_save(new Language(array(
-      'name' => 'French',
-      'id' => 'fr',
-    )));
-    language_save(new Language(array(
-      'name' => 'English',
-      'id' => 'en',
-    )));
-    language_save(new Language(array(
-      'name' => 'German',
-      'id' => 'de',
-    )));
-
-    $this->installSchema('user', 'users');
-    $account = entity_create('user', array(
-      'name' => 'French user',
-      'mail' => 'test@example.com',
-      'created' => REQUEST_TIME,
-      'status' => 1,
-      'preferred_langcode' => 'fr',
-    ));
-
-    $user_config_context = config_context_enter('Drupal\user\UserConfigContext');
-    $user_config_context->setAccount($account);
-    $config = \Drupal::config('config_test.system');
-    $this->assertIdentical($config->get('foo'), 'fr bar');
-    // Ensure the non-overriden value is still the same.
-    $this->assertIdentical($config->get('404'), 'herp');
-
-    // Ensure that we get the expected value when we leave the user context. The
-    // locale overrides contain an English override too, so although we are not
-    // in a user based language override context, the English language override
-    // applies due to the negotiated language for the page.
-    config_context_leave();
-    $config = \Drupal::config('config_test.system');
-    $this->assertIdentical($config->get('foo'), 'en bar');
-
-    $account = entity_create('user', array(
-      'name' => 'German user',
-      'mail' => 'test@example.com',
-      'created' => REQUEST_TIME,
-      'status' => 1,
-      'preferred_langcode' => 'de',
-    ));
-
-    $config_factory = \Drupal::service('config.factory');
-    $config_factory->enterContext($user_config_context->setAccount($account));
-    // Should not have to re-initialize the configuration object to get new
-    // overrides as the new context will have a different uuid.
-    $config = \Drupal::config('config_test.system');
-    $this->assertIdentical($config->get('foo'), 'de bar');
-
-    // Enter an english context on top of the german context.
-    $account = entity_create('user', array(
-      'name' => 'English user',
-      'mail' => 'test@example.com',
-      'created' => REQUEST_TIME,
-      'status' => 1,
-      'preferred_langcode' => 'en',
-    ));
-    // Create a new user config context to stack on top of the existign one.
-    $en_user_config_context = config_context_enter('Drupal\user\UserConfigContext');
-    $en_user_config_context->setAccount($account);
-    $config = \Drupal::config('config_test.system');
-    $this->assertIdentical($config->get('foo'), 'en bar');
-
-    // Ensure that we get the expected value when we leave the english user
-    // context.
-    config_context_leave();
-    $config = \Drupal::config('config_test.system');
-    $this->assertIdentical($config->get('foo'), 'de bar');
-
-    // Ensure that we get the expected value when we leave the german user
-    // context.
-    config_context_leave();
-    $config = \Drupal::config('config_test.system');
-    $this->assertIdentical($config->get('foo'), 'en bar');
-
-    // Ensure that we cannot leave the default context.
-    config_context_leave();
-    $config = \Drupal::config('config_test.system');
-    $this->assertIdentical($config->get('foo'), 'en bar');
-  }
-
-  /**
-   * Tests locale override based on language.
-   */
-  function testConfigLocaleLanguageOverride() {
-    $this->installSchema('system', 'variable');
-    $this->installConfig(array('language'));
-    language_save(new Language(array(
-      'name' => 'French',
-      'id' => 'fr',
-    )));
-    language_save(new Language(array(
-      'name' => 'English',
-      'id' => 'en',
-    )));
-    language_save(new Language(array(
-      'name' => 'German',
-      'id' => 'de',
-    )));
-
-    $language = language_load('fr');
-    $language_config_context = config_context_enter('Drupal\Core\Config\Context\LanguageConfigContext');
-    $language_config_context->setLanguage($language);
-    $config = \Drupal::config('config_test.system');
-    $this->assertIdentical($config->get('foo'), 'fr bar');
-    // Ensure the non-overridden value is still the same.
-    $this->assertIdentical($config->get('404'), 'herp');
-
-    // Ensure that we get the expected value when we leave the language context. The
-    // locale overrides contain an English override too, so although we are not
-    // in a language override context, the English language override
-    // applies due to the negotiated language for the page.
-    config_context_leave();
-    $config = \Drupal::config('config_test.system');
-    $this->assertIdentical($config->get('foo'), 'en bar');
-
-    $config_factory = \Drupal::service('config.factory');
-    $language = language_load('de');
-    $config_factory->enterContext($language_config_context->setLanguage($language));
-    // Should not have to re-initialize the configuration object to get new
-    // overrides as the new context will have a different uuid.
-    $config = \Drupal::config('config_test.system');
-    $this->assertIdentical($config->get('foo'), 'de bar');
-
-    // Enter an english context on top of the german context.
-    $language = language_load('en');
-    // Create a new language config context to stack on top of the existing one.
-    $en_language_config_context = config_context_enter('Drupal\Core\Config\Context\LanguageConfigContext');
-    $en_language_config_context->setLanguage($language);
-    $config = \Drupal::config('config_test.system');
-    $this->assertIdentical($config->get('foo'), 'en bar');
-
-    // Ensure that we get the expected value when we leave the english
-    // language context.
-    config_context_leave();
-    $config = \Drupal::config('config_test.system');
-    $this->assertIdentical($config->get('foo'), 'de bar');
-
-    // Ensure that we get the expected value when we leave the german
-    // language context.
-    config_context_leave();
-    $config = \Drupal::config('config_test.system');
-    $this->assertIdentical($config->get('foo'), 'en bar');
-
-    // Ensure that we cannot leave the default context.
-    config_context_leave();
-    $config = \Drupal::config('config_test.system');
-    $this->assertIdentical($config->get('foo'), 'en bar');
-  }
-
-  /**
-   * Tests locale override in combination with global overrides.
-   */
-  function testConfigLocaleUserAndGlobalOverride() {
-    global $conf;
-
-    // Globally override value for the keys in config_test.system. Although we
-    // override the foo key, there are also language overrides, which trump
-    // global overrides so the 'foo' key override will never surface.
-    $conf['config_test.system']['foo'] = 'global bar';
-    $conf['config_test.system']['404'] = 'global herp';
-
-    $this->installSchema('system', 'variable');
-    $this->installConfig(array('language'));
-    language_save(new Language(array(
-      'name' => 'French',
-      'id' => 'fr',
-    )));
-
-    $this->installSchema('user', 'users');
-    $account = entity_create('user', array(
-      'name' => 'French user',
-      'mail' => 'test@example.com',
-      'created' => REQUEST_TIME,
-      'status' => 1,
-      'preferred_langcode' => 'fr',
-    ));
-
-    $user_config_context = config_context_enter('Drupal\user\UserConfigContext');
-    $user_config_context->setAccount($account);
-    $config = \Drupal::config('config_test.system');
-    $this->assertIdentical($config->get('foo'), 'fr bar');
-    // Ensure the value overriden from global $conf works.
-    $this->assertIdentical($config->get('404'), 'global herp');
-
-    // Ensure that we get the expected value when we leave the user context. The
-    // locale overrides contain an English override too, so although we are not
-    // in a user based language override context, the English language override
-    // applies due to the negotiated language for the page.
-    config_context_leave();
-    $config = \Drupal::config('config_test.system');
-    $this->assertIdentical($config->get('foo'), 'en bar');
-    // Global override should still apply.
-    $this->assertIdentical($config->get('404'), 'global herp');
-
-    // Ensure that we cannot leave the default context.
-    config_context_leave();
-    $config = \Drupal::config('config_test.system');
-    $this->assertIdentical($config->get('foo'), 'en bar');
-    // Global override should still apply.
-    $this->assertIdentical($config->get('404'), 'global herp');
-
-    // Ensure that we get the expected value when we avoid overrides.
-    config_context_enter('config.context.free');
-    $config_admin = \Drupal::config('config_test.system');
-    // Language override should not apply anymore.
-    $this->assertIdentical($config_admin->get('foo'), 'bar');
-    // Global override should not apply.
-    $this->assertIdentical($config_admin->get('404'), 'herp');
-    config_context_leave();
-  }
-
-  /**
-   * Tests config_context_enter() invalid context name handling.
-   */
-  function testInvalidContextName() {
-    $message = 'Expected ConfigException was thrown for an invalid context_name argument.';
-    try {
-      config_context_enter('invalid.config.context');
-      $this->fail($message);
-    }
-    catch (ConfigException $e) {
-      $this->pass($message);
-    }
-  }
-}
diff --git a/core/modules/config/lib/Drupal/config/Tests/ConfigModuleOverridesTest.php b/core/modules/config/lib/Drupal/config/Tests/ConfigModuleOverridesTest.php
new file mode 100644
index 0000000..0d45693
--- /dev/null
+++ b/core/modules/config/lib/Drupal/config/Tests/ConfigModuleOverridesTest.php
@@ -0,0 +1,62 @@
+<?php
+
+/**
+ * @file
+ * Definition of Drupal\config\Tests\ConfigModuleOverridesTest.
+ */
+
+namespace Drupal\config\Tests;
+
+use Drupal\simpletest\DrupalUnitTestBase;
+
+/**
+ * Tests module overrides of configuration using event subscribers.
+ */
+class ConfigModuleOverridesTest extends DrupalUnitTestBase {
+
+  public static $modules = array('system', 'config', 'config_override');
+
+  public static function getInfo() {
+    return array(
+      'name' => 'Module overrides',
+      'description' => 'Tests that modules can override configuration with event subscribers.',
+      'group' => 'Configuration',
+    );
+  }
+
+  public function testSimpleModuleOverrides() {
+    $GLOBALS['config_test_run_module_overrides'] = TRUE;
+    $name = 'system.site';
+    $overridden_name = 'ZOMG overridden site name';
+    $non_overridden_name = 'ZOMG this name is on disk mkay';
+    $overridden_slogan = 'Yay for overrides!';
+    $non_overridden_slogan = 'Yay for defaults!';
+    $config_factory = $this->container->get('config.factory');
+    $config_factory
+      ->get($name)
+      ->set('name', $non_overridden_name)
+      ->set('slogan', $non_overridden_slogan)
+      ->save();
+
+    $config_factory->disableOverrides();
+    $this->assertEqual($non_overridden_name, $config_factory->get('system.site')->get('name'));
+    $this->assertEqual($non_overridden_slogan, $config_factory->get('system.site')->get('slogan'));
+
+    $config_factory->enableOverrides();
+    $this->assertEqual($overridden_name, $config_factory->get('system.site')->get('name'));
+    $this->assertEqual($overridden_slogan, $config_factory->get('system.site')->get('slogan'));
+
+    // Test overrides of completely new configuration objects. In normal runtime
+    // this should only happen for configuration entities as we should not be
+    // creating simple configuration objects on the fly.
+    $config = \Drupal::config('config_override.new');
+    $this->assertTrue($config->isNew(), 'The configuration object config_override.new is new');
+    $this->assertIdentical($config->get('module'), 'override');
+    \Drupal::configFactory()->disableOverrides();
+    $config = \Drupal::config('config_override.new');
+    $this->assertIdentical($config->get('module'), NULL);
+    \Drupal::configFactory()->enableOverrides();
+
+    unset($GLOBALS['config_test_run_module_overrides']);
+  }
+}
diff --git a/core/modules/config/lib/Drupal/config/Tests/ConfigOverrideTest.php b/core/modules/config/lib/Drupal/config/Tests/ConfigOverrideTest.php
index a6016c3..9353b02 100644
--- a/core/modules/config/lib/Drupal/config/Tests/ConfigOverrideTest.php
+++ b/core/modules/config/lib/Drupal/config/Tests/ConfigOverrideTest.php
@@ -61,14 +61,6 @@ function testConfOverride() {
     $this->assertFalse(isset($data['baz']));
     $this->assertIdentical($data['404'], $expected_original_data['404']);
 
-    // Enter an override-free context to ensure the original data remains.
-    config_context_enter('config.context.free');
-    $config = \Drupal::config('config_test.system');
-    $this->assertIdentical($config->get('foo'), $expected_original_data['foo']);
-    $this->assertIdentical($config->get('baz'), $expected_original_data['baz']);
-    $this->assertIdentical($config->get('404'), $expected_original_data['404']);
-    config_context_leave();
-
     // Get the configuration object in an overriden context (the one set by
     // default).
     $config = \Drupal::config('config_test.system');
@@ -100,14 +92,6 @@ function testConfOverride() {
     $this->assertIdentical($config->get('baz'), $conf['config_test.system']['baz']);
     $this->assertIdentical($config->get('404'), $conf['config_test.system']['404']);
 
-    // Enter an override-free context to ensure the original data remains saved.
-    config_context_enter('config.context.free');
-    $config = \Drupal::config('config_test.system');
-    $this->assertIdentical($config->get('foo'), $expected_original_data['foo']);
-    $this->assertIdentical($config->get('baz'), $expected_original_data['baz']);
-    $this->assertIdentical($config->get('404'), $expected_original_data['404']);
-    config_context_leave();
-
     // Write file to staging.
     $staging = $this->container->get('config.storage.staging');
     $expected_new_data = array(
@@ -131,6 +115,18 @@ function testConfOverride() {
     $this->assertIdentical($config->get('foo'), $conf['config_test.system']['foo']);
     $this->assertIdentical($config->get('baz'), $conf['config_test.system']['baz']);
     $this->assertIdentical($config->get('404'), $conf['config_test.system']['404']);
+
+    // Test overrides of completely new configuration objects. In normal runtime
+    // this should only happen for configuration entities as we should not be
+    // creating simple configuration objects on the fly.
+    $conf['config_test.new']['key'] = 'override';
+    $config = \Drupal::config('config_test.new');
+    $this->assertTrue($config->isNew(), 'The configuration object config_test.new is new');
+    $this->assertIdentical($config->get('key'), 'override');
+    \Drupal::configFactory()->disableOverrides();
+    $config = \Drupal::config('config_test.new');
+    $this->assertIdentical($config->get('key'), NULL);
+    \Drupal::configFactory()->enableOverrides();
   }
 
 }
diff --git a/core/modules/config/lib/Drupal/config/Tests/ConfigOverridesPriorityTest.php b/core/modules/config/lib/Drupal/config/Tests/ConfigOverridesPriorityTest.php
new file mode 100644
index 0000000..7657376
--- /dev/null
+++ b/core/modules/config/lib/Drupal/config/Tests/ConfigOverridesPriorityTest.php
@@ -0,0 +1,103 @@
+<?php
+
+/**
+ * @file
+ * Definition of Drupal\config\Tests\ConfigOverridesPriorityTest.
+ */
+
+namespace Drupal\config\Tests;
+
+use Drupal\Core\Language\Language;
+use Drupal\simpletest\DrupalUnitTestBase;
+
+/**
+ * Tests module overrides of configuration using event subscribers.
+ */
+class ConfigOverridesPriorityTest extends DrupalUnitTestBase {
+
+  public static $modules = array('system', 'config', 'config_override');
+
+  public static function getInfo() {
+    return array(
+      'name' => 'Override priority',
+      'description' => 'Tests that language, module and settings.php are applied in the correct order.',
+      'group' => 'Configuration',
+    );
+  }
+
+  public function testOverridePriorities() {
+    global $conf;
+    $GLOBALS['config_test_run_module_overrides'] = FALSE;
+
+    $non_overridden_mail =  'site@example.com';
+    $language_overridden_mail = 'french@example.com';
+
+    $language_overridden_name = 'French site name';
+    $module_overridden_name = 'ZOMG overridden site name';
+    $non_overridden_name = 'ZOMG this name is on disk mkay';
+
+    $module_overridden_slogan = 'Yay for overrides!';
+    $non_overridden_slogan = 'Yay for defaults!';
+
+    /** @var \Drupal\Core\Config\ConfigFactory $config_factory */
+    $config_factory = $this->container->get('config.factory');
+    $config_factory
+      ->get('system.site')
+      ->set('name', $non_overridden_name)
+      ->set('slogan', $non_overridden_slogan)
+      ->set('mail', $non_overridden_mail)
+      ->set('weight_select_max', 50)
+      ->save();
+
+    // Ensure that no overrides are applying.
+    $this->assertEqual($non_overridden_name, $config_factory->get('system.site')->get('name'));
+    $this->assertEqual($non_overridden_slogan, $config_factory->get('system.site')->get('slogan'));
+    $this->assertEqual($non_overridden_mail, $config_factory->get('system.site')->get('mail'));
+    $this->assertEqual(50, $config_factory->get('system.site')->get('weight_select_max'));
+
+    // Override using language.
+    $language = new Language(array(
+      'name' => 'French',
+      'id' => 'fr',
+    ));
+    $config_factory->setLanguage($language);
+    $language_config_name = $config_factory->getLanguageConfigName($language->id, 'system.site');
+    $config_factory
+      ->get($language_config_name)
+      ->set('name', $language_overridden_name)
+      ->set('mail', $language_overridden_mail)
+      ->save();
+
+    $this->assertEqual($language_overridden_name, $config_factory->get('system.site')->get('name'));
+    $this->assertEqual($non_overridden_slogan, $config_factory->get('system.site')->get('slogan'));
+    $this->assertEqual($language_overridden_mail, $config_factory->get('system.site')->get('mail'));
+    $this->assertEqual(50, $config_factory->get('system.site')->get('weight_select_max'));
+
+    // Enable module overrides. Do not override system.site:mail to prove that
+    // the language override still applies.
+    $GLOBALS['config_test_run_module_overrides'] = TRUE;
+    $config_factory->reset('system.site');
+    $this->assertEqual($module_overridden_name, $config_factory->get('system.site')->get('name'));
+    $this->assertEqual($module_overridden_slogan, $config_factory->get('system.site')->get('slogan'));
+    $this->assertEqual($language_overridden_mail, $config_factory->get('system.site')->get('mail'));
+    $this->assertEqual(50, $config_factory->get('system.site')->get('weight_select_max'));
+
+    // Configure a global override to simulate overriding using settings.php. Do
+    // not override system.site:mail or system.site:slogan to prove that the
+    // language and module overrides still apply.
+    $conf['system.site']['name'] = 'Site name global conf override';
+    $config_factory->reset('system.site');
+    $this->assertEqual('Site name global conf override', $config_factory->get('system.site')->get('name'));
+    $this->assertEqual($module_overridden_slogan, $config_factory->get('system.site')->get('slogan'));
+    $this->assertEqual($language_overridden_mail, $config_factory->get('system.site')->get('mail'));
+    $this->assertEqual(50, $config_factory->get('system.site')->get('weight_select_max'));
+
+    $config_factory->disableOverrides();
+    $this->assertEqual($non_overridden_name, $config_factory->get('system.site')->get('name'));
+    $this->assertEqual($non_overridden_slogan, $config_factory->get('system.site')->get('slogan'));
+    $this->assertEqual($non_overridden_mail, $config_factory->get('system.site')->get('mail'));
+    $this->assertEqual(50, $config_factory->get('system.site')->get('weight_select_max'));
+
+    unset($GLOBALS['config_test_run_module_overrides']);
+  }
+}
diff --git a/core/modules/config/lib/Drupal/config/Tests/ConfigSnapshotTest.php b/core/modules/config/lib/Drupal/config/Tests/ConfigSnapshotTest.php
index d9504b2..34743d5 100644
--- a/core/modules/config/lib/Drupal/config/Tests/ConfigSnapshotTest.php
+++ b/core/modules/config/lib/Drupal/config/Tests/ConfigSnapshotTest.php
@@ -79,6 +79,7 @@ function testSnapshot() {
     $this->configImporter()->import();
 
     // Verify changed config was properly imported.
+    \Drupal::configFactory()->reset($config_name);
     $this->assertIdentical(\Drupal::config($config_name)->get($config_key), $new_data);
 
     // Verify that a new snapshot was created which and that it matches
diff --git a/core/modules/config/tests/config_override/config_override.info.yml b/core/modules/config/tests/config_override/config_override.info.yml
new file mode 100644
index 0000000..1ccb50b
--- /dev/null
+++ b/core/modules/config/tests/config_override/config_override.info.yml
@@ -0,0 +1,6 @@
+name: 'Configuration override test'
+type: module
+package: Testing
+version: VERSION
+core: 8.x
+hidden: true
diff --git a/core/modules/config/tests/config_override/config_override.module b/core/modules/config/tests/config_override/config_override.module
new file mode 100644
index 0000000..0261055
--- /dev/null
+++ b/core/modules/config/tests/config_override/config_override.module
@@ -0,0 +1,6 @@
+<?php
+
+/**
+ * @file
+ * Provides Config module for testing overrides.
+ */
diff --git a/core/modules/config/tests/config_override/config_override.services.yml b/core/modules/config/tests/config_override/config_override.services.yml
new file mode 100644
index 0000000..586ce49
--- /dev/null
+++ b/core/modules/config/tests/config_override/config_override.services.yml
@@ -0,0 +1,9 @@
+services:
+  config_override_config_subscriber:
+    class: Drupal\config_override\EventSubscriber\ConfigModuleOverrideSubscriber
+    tags:
+      - { name: event_subscriber }
+  config_override_low_priority_config_subscriber:
+    class: Drupal\config_override\EventSubscriber\ConfigModuleLowPriorityOverrideSubscriber
+    tags:
+      - { name: event_subscriber }
diff --git a/core/modules/config/tests/config_override/lib/Drupal/config_override/EventSubscriber/ConfigModuleLowPriorityOverrideSubscriber.php b/core/modules/config/tests/config_override/lib/Drupal/config_override/EventSubscriber/ConfigModuleLowPriorityOverrideSubscriber.php
new file mode 100644
index 0000000..1e1b5ef
--- /dev/null
+++ b/core/modules/config/tests/config_override/lib/Drupal/config_override/EventSubscriber/ConfigModuleLowPriorityOverrideSubscriber.php
@@ -0,0 +1,43 @@
+<?Php
+
+/**
+ * @file
+ * Contains \Drupal\config_override\EventSubscriber\ConfigModuleLowPriorityOverrideSubscriber.
+ */
+
+namespace Drupal\config_override\EventSubscriber;
+
+use Drupal\Core\Config\ConfigModuleOverridesEvent;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+
+/**
+ * Tests module overrides for configuration.
+ */
+class ConfigModuleLowPriorityOverrideSubscriber implements EventSubscriberInterface {
+
+  public function onConfigModuleOverride(ConfigModuleOverridesEvent $event) {
+    if (!empty($GLOBALS['config_test_run_module_overrides'])) {
+      $names = $event->getNames();
+      if (in_array('system.site', $names)) {
+        $event->setOverride('system.site', array(
+          'name' => 'Should not apply because of higher priority listener',
+          // This override should apply because it is not overridden by the
+          // higher priority listener.
+          'slogan' => 'Yay for overrides!',
+        ));
+      }
+    }
+  }
+
+  /**
+   * Registers the methods in this class that should be listeners.
+   *
+   * @return array
+   *   An array of event listener definitions.
+   */
+  static function getSubscribedEvents() {
+    $events['config.module.overrides'][] = array('onConfigModuleOverride', 35);
+    return $events;
+  }
+}
+
diff --git a/core/modules/config/tests/config_override/lib/Drupal/config_override/EventSubscriber/ConfigModuleOverrideSubscriber.php b/core/modules/config/tests/config_override/lib/Drupal/config_override/EventSubscriber/ConfigModuleOverrideSubscriber.php
new file mode 100644
index 0000000..54f0f64
--- /dev/null
+++ b/core/modules/config/tests/config_override/lib/Drupal/config_override/EventSubscriber/ConfigModuleOverrideSubscriber.php
@@ -0,0 +1,41 @@
+<?Php
+
+/**
+ * @file
+ * Contains \Drupal\config_override\EventSubscriber\ConfigModuleOverrideSubscriber.
+ */
+
+namespace Drupal\config_override\EventSubscriber;
+
+use Drupal\Core\Config\ConfigModuleOverridesEvent;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+
+/**
+ * Tests module overrides for configuration.
+ */
+class ConfigModuleOverrideSubscriber implements EventSubscriberInterface {
+
+  public function onConfigModuleOverride(ConfigModuleOverridesEvent $event) {
+    if (!empty($GLOBALS['config_test_run_module_overrides'])) {
+      $names = $event->getNames();
+      if (in_array('system.site', $names)) {
+        $event->setOverride('system.site', array('name' => 'ZOMG overridden site name'));
+      }
+      if (in_array('config_override.new', $names)) {
+        $event->setOverride('config_override.new', array('module' => 'override'));
+      }
+    }
+  }
+
+  /**
+   * Registers the methods in this class that should be listeners.
+   *
+   * @return array
+   *   An array of event listener definitions.
+   */
+  static function getSubscribedEvents() {
+    $events['config.module.overrides'][] = array('onConfigModuleOverride', 40);
+    return $events;
+  }
+}
+
diff --git a/core/modules/config/tests/config_test/config/locale.config.de.config_test.system.yml b/core/modules/config/tests/config_test/config/language.config.de.config_test.system.yml
similarity index 100%
rename from core/modules/config/tests/config_test/config/locale.config.de.config_test.system.yml
rename to core/modules/config/tests/config_test/config/language.config.de.config_test.system.yml
diff --git a/core/modules/config/tests/config_test/config/locale.config.en.config_test.system.yml b/core/modules/config/tests/config_test/config/language.config.en.config_test.system.yml
similarity index 100%
rename from core/modules/config/tests/config_test/config/locale.config.en.config_test.system.yml
rename to core/modules/config/tests/config_test/config/language.config.en.config_test.system.yml
diff --git a/core/modules/config/tests/config_test/config/locale.config.fr.config_test.system.yml b/core/modules/config/tests/config_test/config/language.config.fr.config_test.system.yml
similarity index 100%
rename from core/modules/config/tests/config_test/config/locale.config.fr.config_test.system.yml
rename to core/modules/config/tests/config_test/config/language.config.fr.config_test.system.yml
diff --git a/core/modules/config_translation/lib/Drupal/config_translation/Form/ConfigTranslationDeleteForm.php b/core/modules/config_translation/lib/Drupal/config_translation/Form/ConfigTranslationDeleteForm.php
index 01304ae..3950667 100644
--- a/core/modules/config_translation/lib/Drupal/config_translation/Form/ConfigTranslationDeleteForm.php
+++ b/core/modules/config_translation/lib/Drupal/config_translation/Form/ConfigTranslationDeleteForm.php
@@ -10,6 +10,7 @@
 use Drupal\config_translation\ConfigMapperManagerInterface;
 use Drupal\Core\Cache\Cache;
 use Drupal\Core\Config\StorageInterface;
+use Drupal\Core\Config\ConfigFactory;
 use Drupal\Core\Extension\ModuleHandlerInterface;
 use Drupal\Core\Form\ConfirmFormBase;
 use Symfony\Component\DependencyInjection\ContainerInterface;
@@ -65,11 +66,14 @@ class ConfigTranslationDeleteForm extends ConfirmFormBase {
    *   The configuration mapper manager.
    * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
    *   The module handler.
+   * @param \Drupal\Core\Config\ConfigFactory $config_factory
+   *   The configuration factory.
    */
-  public function __construct(StorageInterface $config_storage, ConfigMapperManagerInterface $config_mapper_manager, ModuleHandlerInterface $module_handler) {
+  public function __construct(StorageInterface $config_storage, ConfigMapperManagerInterface $config_mapper_manager, ModuleHandlerInterface $module_handler, ConfigFactory $config_factory) {
     $this->configStorage = $config_storage;
     $this->configMapperManager = $config_mapper_manager;
     $this->moduleHandler = $module_handler;
+    $this->configFactory = $config_factory;
   }
 
   /**
@@ -79,7 +83,8 @@ public static function create(ContainerInterface $container) {
     return new static(
       $container->get('config.storage'),
       $container->get('plugin.manager.config_translation.mapper'),
-      $container->get('module_handler')
+      $container->get('module_handler'),
+      $container->get('config.factory')
     );
   }
 
@@ -137,7 +142,8 @@ public function buildForm(array $form, array &$form_state, Request $request = NU
    */
   public function submitForm(array &$form, array &$form_state) {
     foreach ($this->mapper->getConfigNames() as $name) {
-      $this->configStorage->delete('locale.config.' . $this->language->id . '.' . $name);
+      $config_name = $this->configFactory->getLanguageConfigName($this->language->id, $name);
+      $this->configStorage->delete($config_name);
     }
 
     // Flush all persistent caches.
diff --git a/core/modules/config_translation/lib/Drupal/config_translation/Form/ConfigTranslationFormBase.php b/core/modules/config_translation/lib/Drupal/config_translation/Form/ConfigTranslationFormBase.php
index e559ea1..9295b81 100644
--- a/core/modules/config_translation/lib/Drupal/config_translation/Form/ConfigTranslationFormBase.php
+++ b/core/modules/config_translation/lib/Drupal/config_translation/Form/ConfigTranslationFormBase.php
@@ -9,6 +9,7 @@
 
 use Drupal\config_translation\ConfigMapperManagerInterface;
 use Drupal\Core\Config\Config;
+use Drupal\Core\Config\ConfigFactory;
 use Drupal\Core\Config\Schema\Element;
 use Drupal\Core\Config\TypedConfigManager;
 use Drupal\Core\Extension\ModuleHandlerInterface;
@@ -92,12 +93,15 @@
    *   The translation storage object.
    * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
    *   The module handler to invoke the alter hook.
+   * @param \Drupal\Core\Config\ConfigFactory
+   *   The config factory.
    */
-  public function __construct(TypedConfigManager $typed_config_manager, ConfigMapperManagerInterface $config_mapper_manager, StringStorageInterface $locale_storage, ModuleHandlerInterface $module_handler) {
+  public function __construct(TypedConfigManager $typed_config_manager, ConfigMapperManagerInterface $config_mapper_manager, StringStorageInterface $locale_storage, ModuleHandlerInterface $module_handler, ConfigFactory $config_factory) {
     $this->typedConfigManager = $typed_config_manager;
     $this->configMapperManager = $config_mapper_manager;
     $this->localeStorage = $locale_storage;
     $this->moduleHandler = $module_handler;
+    $this->configFactory = $config_factory;
   }
 
   /**
@@ -108,7 +112,8 @@ public static function create(ContainerInterface $container) {
       $container->get('config.typed'),
       $container->get('plugin.manager.config_translation.mapper'),
       $container->get('locale.storage'),
-      $container->get('module_handler')
+      $container->get('module_handler'),
+      $container->get('config.factory')
     );
   }
 
@@ -158,20 +163,16 @@ public function buildForm(array $form, array &$form_state, Request $request = NU
     $this->language = $language;
     $this->sourceLanguage = $this->mapper->getLanguageWithFallback();
 
-    // Make sure we are in the override free configuration context. For example,
-    // visiting the configuration page in another language would make those
-    // language overrides active by default. But we need the original values.
-    config_context_enter('config.context.free');
     // Get base language configuration to display in the form before entering
     // into the language context for the form. This avoids repetitively going
     // in and out of the language context to get original values later.
+    $this->configFactory->disableOverrides();
     $this->baseConfigData = $this->mapper->getConfigData();
-    // Leave override free context.
-    config_context_leave();
+    $this->configFactory->enableOverrides();
 
-    // Enter context for the translation target language requested and generate
-    // form with translation data in that language.
-    config_context_enter('Drupal\Core\Config\Context\LanguageConfigContext')->setLanguage($this->language);
+    // Set the translation target language on the configuration factory.
+    $original_language = $this->configFactory->getLanguage();
+    $this->configFactory->setLanguage($this->language);
 
     // Add some information to the form state for easier form altering.
     $form_state['config_translation_mapper'] = $this->mapper;
@@ -196,9 +197,8 @@ public function buildForm(array $form, array &$form_state, Request $request = NU
       '#button_type' => 'primary',
     );
 
-    // Leave the language context so that configuration accessed later in the
-    // request is displayed in the correct language.
-    config_context_leave();
+    // Set the configuration language back.
+    $this->configFactory->setLanguage($original_language);
 
     return $form;
   }
@@ -209,13 +209,13 @@ public function buildForm(array $form, array &$form_state, Request $request = NU
   public function submitForm(array &$form, array &$form_state) {
     $form_values = $form_state['values']['config_names'];
 
-    // For the form submission handling, use the override free context.
-    config_context_enter('config.context.free');
-
+    // For the form submission handling, use the raw data.
+    $this->configFactory->disableOverrides();
     foreach ($this->mapper->getConfigNames() as $name) {
       // Set configuration values based on form submission and source values.
       $base_config = $this->config($name);
-      $translation_config = $this->config('locale.config.' . $this->language->id . '.' . $name);
+      $translation_config_name = $this->configFactory->getLanguageConfigName($this->language->id, $name);
+      $translation_config = $this->config($translation_config_name);
       $locations = $this->localeStorage->getLocations(array('type' => 'configuration', 'name' => $name));
 
       $this->setConfig($this->language, $base_config, $translation_config, $form_values[$name], !empty($locations));
@@ -229,8 +229,7 @@ public function submitForm(array &$form, array &$form_state) {
         $translation_config->save();
       }
     }
-
-    config_context_leave();
+    $this->configFactory->enableOverrides();
 
     $form_state['redirect_route'] = array(
       'route_name' => $this->mapper->getOverviewRoute(),
diff --git a/core/modules/config_translation/lib/Drupal/config_translation/Tests/ConfigTranslationUiTest.php b/core/modules/config_translation/lib/Drupal/config_translation/Tests/ConfigTranslationUiTest.php
index 83f4a14..c6e4094 100644
--- a/core/modules/config_translation/lib/Drupal/config_translation/Tests/ConfigTranslationUiTest.php
+++ b/core/modules/config_translation/lib/Drupal/config_translation/Tests/ConfigTranslationUiTest.php
@@ -178,7 +178,8 @@ public function testSourceValueDuplicateSave() {
 
     // Read overridden file from active config.
     $file_storage = new FileStorage($this->configDirectories[CONFIG_ACTIVE_DIRECTORY]);
-    $config_parsed = $file_storage->read('locale.config.fr.system.site');
+    $language_config_name = \Drupal::configFactory()->getLanguageConfigName('fr', 'system.site');
+    $config_parsed = $file_storage->read($language_config_name);
 
     // Expect both name and slogan in language specific file.
     $expected = array(
@@ -199,7 +200,7 @@ public function testSourceValueDuplicateSave() {
     );
     $this->drupalPostForm(NULL, $edit, t('Save translation'));
     $this->assertRaw(t('Successfully updated @language translation.', array('@language' => 'French')));
-    $config_parsed = $file_storage->read('locale.config.fr.system.site');
+    $config_parsed = $file_storage->read($language_config_name);
 
     // Expect only slogan in language specific file.
     $expected = array('slogan' => 'FR ' . $site_slogan);
@@ -213,7 +214,7 @@ public function testSourceValueDuplicateSave() {
       'config_names[system.site][slogan][translation]' => $site_slogan,
     );
     $this->drupalPostForm(NULL, $edit, t('Save translation'));
-    $config_parsed = $file_storage->read('locale.config.fr.system.site');
+    $config_parsed = $file_storage->read($language_config_name);
 
     // Expect no language specific file.
     $this->assertFalse($config_parsed);
@@ -284,7 +285,8 @@ public function testContactConfigEntityTranslation() {
       $this->drupalPostForm($translation_page_url, $edit, t('Save translation'));
 
       // Expect translated values in language specific file.
-      $config_parsed = $file_storage->read('locale.config.'. $langcode . '.contact.category.feedback');
+      $language_config_name = \Drupal::configFactory()->getLanguageConfigName($langcode, 'contact.category.feedback');
+      $config_parsed = $file_storage->read($language_config_name);
       $expected = array(
         'label' => 'Website feedback - ' . $langcode,
         'reply' => 'Thank you for your mail - ' . $langcode,
@@ -347,7 +349,8 @@ public function testContactConfigEntityTranslation() {
       $this->assertNoLinkByHref("$translation_base_url/$langcode/delete");
 
       // Expect no language specific file present anymore.
-      $config_parsed = $file_storage->read('locale.config.'. $langcode . '.config.category.feedback');
+      $language_config_name = \Drupal::configFactory()->getLanguageConfigName($langcode, 'contact.category.feedback');
+      $config_parsed = $file_storage->read($language_config_name);
       $this->assertFalse($config_parsed);
     }
 
@@ -414,7 +417,8 @@ public function testDateFormatTranslation() {
       $this->drupalPostForm($translation_page_url, $edit, t('Save translation'));
 
       // Get translation and check we've got the right value.
-      $config_parsed = $file_storage->read('locale.config.fr.system.date_format.' . $id);
+      $language_config_name = \Drupal::configFactory()->getLanguageConfigName('fr', 'system.date_format.' . $id);
+      $config_parsed = $file_storage->read($language_config_name);
       $expected = array(
         'label' => $id . ' - FR',
         'pattern' => array('php' => 'D'),
diff --git a/core/modules/language/language.services.yml b/core/modules/language/language.services.yml
index d6599b3..05b4798 100644
--- a/core/modules/language/language.services.yml
+++ b/core/modules/language/language.services.yml
@@ -5,3 +5,8 @@ services:
     tags:
       - { name: path_processor_inbound, priority: 300 }
       - { name: path_processor_outbound, priority: 100 }
+  language_config_subscriber:
+    class: Drupal\language\LanguageConfigSubscriber
+    tags:
+      - { name: event_subscriber }
+    arguments: ['@language_manager', '@config.factory']
diff --git a/core/modules/language/lib/Drupal/language/Form/ContentLanguageSettingsForm.php b/core/modules/language/lib/Drupal/language/Form/ContentLanguageSettingsForm.php
index 6cd8514..7162eea 100644
--- a/core/modules/language/lib/Drupal/language/Form/ContentLanguageSettingsForm.php
+++ b/core/modules/language/lib/Drupal/language/Form/ContentLanguageSettingsForm.php
@@ -8,7 +8,6 @@
 namespace Drupal\language\Form;
 
 use Drupal\Core\Config\ConfigFactory;
-use Drupal\Core\Config\Context\ContextInterface;
 use Drupal\Core\Entity\EntityManagerInterface;
 use Drupal\Core\Form\ConfigFormBase;
 use Symfony\Component\DependencyInjection\ContainerInterface;
@@ -30,13 +29,11 @@ class ContentLanguageSettingsForm extends ConfigFormBase {
    *
    * @param \Drupal\Core\Config\ConfigFactory $config_factory
    *   The config factory.
-   * @param \Drupal\Core\Config\Context\ContextInterface $context
-   *   The configuration context to use.
    * @param \Drupal\Core\Entity\EntityManagerInterface $entity_manager
    *   The entity manager.
    */
-  public function __construct(ConfigFactory $config_factory, ContextInterface $context, EntityManagerInterface $entity_manager) {
-    parent::__construct($config_factory, $context);
+  public function __construct(ConfigFactory $config_factory, EntityManagerInterface $entity_manager) {
+    parent::__construct($config_factory);
 
     $this->entityManager = $entity_manager;
   }
@@ -47,7 +44,6 @@ public function __construct(ConfigFactory $config_factory, ContextInterface $con
   public static function create(ContainerInterface $container) {
     return new static(
       $container->get('config.factory'),
-      $container->get('config.context.free'),
       $container->get('entity.manager')
     );
   }
diff --git a/core/modules/language/lib/Drupal/language/Form/NegotiationBrowserForm.php b/core/modules/language/lib/Drupal/language/Form/NegotiationBrowserForm.php
index 2271b14..0537a6a 100644
--- a/core/modules/language/lib/Drupal/language/Form/NegotiationBrowserForm.php
+++ b/core/modules/language/lib/Drupal/language/Form/NegotiationBrowserForm.php
@@ -8,7 +8,6 @@
 namespace Drupal\language\Form;
 
 use Drupal\Core\Config\ConfigFactory;
-use Drupal\Core\Config\Context\ContextInterface;
 use Drupal\Core\Extension\ModuleHandlerInterface;
 use Drupal\Core\Form\ConfigFormBase;
 use Symfony\Component\DependencyInjection\ContainerInterface;
@@ -31,8 +30,8 @@ class NegotiationBrowserForm extends ConfigFormBase {
    * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
    *   The module handler
    */
-  public function __construct(ConfigFactory $config_factory, ContextInterface $context, ModuleHandlerInterface $module_handler) {
-    parent::__construct($config_factory, $context);
+  public function __construct(ConfigFactory $config_factory, ModuleHandlerInterface $module_handler) {
+    parent::__construct($config_factory);
     $this->moduleHandler = $module_handler;
   }
 
@@ -42,7 +41,6 @@ public function __construct(ConfigFactory $config_factory, ContextInterface $con
   public static function create(ContainerInterface $container) {
     return new static(
       $container->get('config.factory'),
-      $container->get('config.context.free'),
       $container->get('module_handler')
     );
   }
@@ -196,5 +194,5 @@ protected function language_get_browser_drupal_langcode_mappings() {
     }
     return $config->get();
   }
-
 }
+
diff --git a/core/modules/language/lib/Drupal/language/LanguageConfigSubscriber.php b/core/modules/language/lib/Drupal/language/LanguageConfigSubscriber.php
new file mode 100644
index 0000000..702b857
--- /dev/null
+++ b/core/modules/language/lib/Drupal/language/LanguageConfigSubscriber.php
@@ -0,0 +1,68 @@
+<?php
+/**
+ * @file
+ * Contains \Drupal\language\LanguageConfigSubscriber.
+ */
+
+namespace Drupal\language;
+
+use Drupal\Core\Config\ConfigFactory;
+use Drupal\Core\Config\StorageDispatcher;
+use Drupal\Core\Language\LanguageManager;
+use Symfony\Component\HttpKernel\KernelEvents;
+use Symfony\Component\HttpKernel\Event\GetResponseEvent;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+
+/**
+ * Language event subscriber to set language on configuration factory service.
+ */
+class LanguageConfigSubscriber implements EventSubscriberInterface {
+
+  /**
+   * The language manager.
+   *
+   * @var \Drupal\Core\Language\LanguageManager
+   */
+  protected $languageManager;
+
+  /**
+   * The configuration factory.
+   *
+   * @var \Drupal\Core\Config\ConfigFactory
+   */
+  protected $configFactory;
+
+  /**
+   * Constructs a LanguageConfigSubscriber object.
+   *
+   * @param \Drupal\Core\Language\LanguageManager $language_manager
+   *   The language manager service.
+   * @param \Drupal\Core\Config\ConfigFactory $config_factory
+   *   The configuration object factory.
+   */
+  public function __construct(LanguageManager $language_manager, ConfigFactory $config_factory) {
+    $this->languageManager = $language_manager;
+    $this->configFactory = $config_factory;
+  }
+
+  /**
+   * Sets the negotiated interface language on the configuration factory.
+   *
+   * @param \Symfony\Component\HttpKernel\Event\GetResponseEvent $event
+   *   Kernel event to respond to.
+   */
+  public function onKernelRequestSetDefaultConfigLanguage(GetResponseEvent $event) {
+    if ($this->languageManager->isMultiLingual()) {
+      $this->configFactory->setLanguage($this->languageManager->getLanguage());
+    }
+  }
+
+  /**
+   * Implements EventSubscriberInterface::getSubscribedEvents().
+   */
+  static function getSubscribedEvents() {
+    $events[KernelEvents::REQUEST][] = array('onKernelRequestSetDefaultConfigLanguage', 48);
+    return $events;
+  }
+}
+
diff --git a/core/modules/locale/lib/Drupal/locale/LocaleConfigManager.php b/core/modules/locale/lib/Drupal/locale/LocaleConfigManager.php
index 9284444..bd06d76 100644
--- a/core/modules/locale/lib/Drupal/locale/LocaleConfigManager.php
+++ b/core/modules/locale/lib/Drupal/locale/LocaleConfigManager.php
@@ -11,6 +11,7 @@
 use Drupal\Core\Language\Language;
 use Drupal\Core\Config\TypedConfigManager;
 use Drupal\Core\Config\StorageInterface;
+use Drupal\Core\Config\ConfigFactory;
 
 /**
  * Manages localized configuration type plugins.
@@ -37,6 +38,13 @@ class LocaleConfigManager extends TypedConfigManager {
   protected $translations;
 
   /**
+   * The configuration factory.
+   *
+   * @var \Drupal\Core\Config\ConfigFactory
+   */
+  protected $configFactory;
+
+  /**
    * Creates a new typed configuration manager.
    *
    * @param \Drupal\Core\Config\StorageInterface $configStorage
@@ -50,12 +58,15 @@ class LocaleConfigManager extends TypedConfigManager {
    *   The locale storage to use for reading string translations.
    * @param \Drupal\Core\Cache\CacheBackendInterface $cache
    *   The cache backend to use for caching the definitions.
+   * @param \Drupal\Core\Config\ConfigFactory $config_factory
+   *   The configuration factory
    */
-  public function __construct(StorageInterface $configStorage, StorageInterface $schemaStorage, StorageInterface $installStorage, StringStorageInterface $localeStorage, CacheBackendInterface $cache) {
+  public function __construct(StorageInterface $configStorage, StorageInterface $schemaStorage, StorageInterface $installStorage, StringStorageInterface $localeStorage, CacheBackendInterface $cache, ConfigFactory $config_factory) {
     // Note we use the install storage for the parent constructor.
     parent::__construct($configStorage, $schemaStorage, $cache);
     $this->installStorage = $installStorage;
     $this->localeStorage = $localeStorage;
+    $this->configFactory = $config_factory;
   }
 
   /**
@@ -122,7 +133,7 @@ protected function compareConfigData(array $default, $updated) {
    *   Configuration data to be saved, that will be only the translated values.
    */
   public function saveTranslationData($name, $langcode, array $data) {
-    $locale_name = self::localeConfigName($langcode, $name);
+    $locale_name = $this->configFactory->getLanguageConfigName($langcode, $name);
     $this->configStorage->write($locale_name, $data);
   }
 
@@ -135,7 +146,7 @@ public function saveTranslationData($name, $langcode, array $data) {
    *   Language code.
    */
   public function deleteTranslationData($name, $langcode) {
-    $locale_name = self::localeConfigName($langcode, $name);
+    $locale_name = $this->configFactory->getLanguageConfigName($langcode, $name);
     $this->configStorage->delete($locale_name);
   }
 
@@ -209,7 +220,7 @@ public function getStringNames(array $lids) {
    *   Language code to delete.
    */
   public function deleteLanguageTranslations($langcode) {
-    $locale_name = self::localeConfigName($langcode);
+    $locale_name = ConfigFactory::LANGUAGE_CONFIG_PREFIX . '.' . $langcode . '.';
     foreach ($this->configStorage->listAll($locale_name) as $name) {
       $this->configStorage->delete($name);
     }
@@ -294,24 +305,9 @@ public function translateString($name, $langcode, $source, $context) {
    *   A boolean indicating if a language has configuration translations.
    */
   public function hasTranslation($name, Language $language) {
-    $locale_name = static::localeConfigName($language->id, $name);
+    $locale_name = $this->configFactory->getLanguageConfigName($language->id, $name);
     $translation = $this->configStorage->read($locale_name);
     return !empty($translation);
   }
 
-  /**
-   * Provides configuration data location for given langcode and name.
-   *
-   * @param string $langcode
-   *   The language code.
-   * @param string|null $name
-   *   Name of the original configuration. Set to NULL to get the name prefix
-   *   for all $langcode overrides.
-   *
-   * @return string
-   */
-  public static function localeConfigName($langcode, $name = NULL) {
-    return rtrim('locale.config.' . $langcode . '.' . $name, '.');
-  }
-
 }
diff --git a/core/modules/locale/lib/Drupal/locale/LocaleConfigSubscriber.php b/core/modules/locale/lib/Drupal/locale/LocaleConfigSubscriber.php
deleted file mode 100644
index 11fa899..0000000
--- a/core/modules/locale/lib/Drupal/locale/LocaleConfigSubscriber.php
+++ /dev/null
@@ -1,142 +0,0 @@
-<?php
-/**
- * @file
- * Contains \Drupal\locale\LocaleConfigSubscriber.
- */
-
-namespace Drupal\locale;
-
-use Drupal\Core\Config\Config;
-use Drupal\Core\Config\Context\ConfigContext;
-use Drupal\Core\Config\Context\ContextInterface;
-use Drupal\Core\Config\ConfigEvent;
-use Drupal\Core\Config\StorageDispatcher;
-use Drupal\Core\Language\Language;
-use Drupal\Core\Language\LanguageManager;
-use Symfony\Component\HttpKernel\HttpKernelInterface;
-use Symfony\Component\HttpKernel\KernelEvents;
-use Symfony\Component\HttpKernel\Event\GetResponseEvent;
-use Symfony\Component\EventDispatcher\EventSubscriberInterface;
-
-
-/**
- * Locale Config helper
- *
- * $config is always a DrupalConfig object.
- */
-class LocaleConfigSubscriber implements EventSubscriberInterface {
-
-  /**
-   * The language manager.
-   *
-   * @var \Drupal\Core\Language\LanguageManager
-   */
-  protected $languageManager;
-
-  /**
-   * Default configuration context.
-   *
-   * @var \Drupal\Core\Config\Context\ContextInterface
-   */
-  protected $defaultConfigContext;
-
-  /**
-   * Constructs a LocaleConfigSubscriber object.
-   *
-   * @param \Drupal\Core\Language\LanguageManager $language_manager
-   *   The language manager service.
-   * @param \Drupal\Core\Config\Context\ConfigContext $config_context
-   *   The configuration context service.
-   */
-  public function __construct(LanguageManager $language_manager, ContextInterface $config_context) {
-    $this->languageManager = $language_manager;
-    $this->defaultConfigContext = $config_context;
-  }
-
-  /**
-   * Initializes configuration context with language.
-   *
-   * @param \Drupal\Core\Config\ConfigEvent $event
-   *   The Event to process.
-   */
-  public function configContext(ConfigEvent $event) {
-    $context = $event->getContext();
-
-    // If there is a language set explicitly in the current context, use it.
-    // Otherwise check if there is a user set in the current context,
-    // to set the language based on the preferred language of the user.
-    // Otherwise set it based on the negotiated interface language.
-    if ($language = $context->get('language')) {
-      $context->set('locale.language', $language);
-    }
-    elseif ($account = $context->get('user.account')) {
-      $context->set('locale.language', language_load($account->getPreferredLangcode()));
-    }
-    elseif ($language = $this->languageManager->getLanguage(Language::TYPE_INTERFACE)) {
-      $context->set('locale.language', $language);
-    }
-  }
-
-  /**
-   * Override configuration values with localized data.
-   *
-   * @param \Drupal\Core\Config\ConfigEvent $event
-   *   The Event to process.
-   */
-  public function configLoad(ConfigEvent $event) {
-    $context = $event->getContext();
-    if ($language = $context->get('locale.language')) {
-      $config = $event->getConfig();
-      $locale_name = $this->getLocaleConfigName($config->getName(), $language);
-      // Check to see if the config storage has an appropriately named file
-      // containing override data.
-      if ($override = $event->getConfig()->getStorage()->read($locale_name)) {
-        $config->setOverride($override);
-      }
-    }
-  }
-
-  /**
-   * Sets the negotiated interface language on the default configuration context.
-   *
-   * @param \Symfony\Component\HttpKernel\Event\GetResponseEvent $event
-   *   Kernel event to respond to.
-   */
-  public function onKernelRequestSetDefaultConfigContextLocale(GetResponseEvent $event) {
-    // Re-initialize the default configuration context to ensure any cached
-    // configuration object are reset and can be translated. This will invoke
-    // the config context event which will retrieve the negotiated language
-    // from the language manager in configContext().
-    $this->defaultConfigContext->init();
-  }
-
-  /**
-   * Get configuration name for this language.
-   *
-   * It will be the same name with a prefix depending on language code:
-   * locale.config.LANGCODE.NAME
-   *
-   * @param string $name
-   *   The name of the config object.
-   * @param \Drupal\Core\Language\Language $language
-   *   The language object.
-   *
-   * @return string
-   *   The localized config name.
-   */
-  public function getLocaleConfigName($name, Language $language) {
-    return 'locale.config.' . $language->id . '.' . $name;
-  }
-
-  /**
-   * Implements EventSubscriberInterface::getSubscribedEvents().
-   */
-  static function getSubscribedEvents() {
-    $events['config.context'][] = array('configContext', 20);
-    $events['config.load'][] = array('configLoad', 20);
-    // Set the priority above the one from the RouteListener (priority 32)
-    // so ensure that the context is cleared before the routing system steps in.
-    $events[KernelEvents::REQUEST][] = array('onKernelRequestSetDefaultConfigContextLocale', 48);
-    return $events;
-  }
-}
diff --git a/core/modules/locale/lib/Drupal/locale/ParamConverter/LocaleAdminPathConfigEntityConverter.php b/core/modules/locale/lib/Drupal/locale/ParamConverter/LocaleAdminPathConfigEntityConverter.php
index 1be24be..6488eb4 100644
--- a/core/modules/locale/lib/Drupal/locale/ParamConverter/LocaleAdminPathConfigEntityConverter.php
+++ b/core/modules/locale/lib/Drupal/locale/ParamConverter/LocaleAdminPathConfigEntityConverter.php
@@ -9,6 +9,8 @@
 
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\Routing\Route;
+use Drupal\Core\Config\ConfigFactory;
+use Drupal\Core\Entity\EntityManagerInterface;
 use Drupal\Core\ParamConverter\EntityConverter;
 use Drupal\Core\ParamConverter\ParamConverterInterface;
 
@@ -29,17 +31,33 @@
 class LocaleAdminPathConfigEntityConverter extends EntityConverter {
 
   /**
+   * The config factory.
+   *
+   * @var \Drupal\Core\Config\ConfigFactory
+   */
+  protected $configFactory;
+
+  /**
+   * Constructs a new EntityConverter.
+   *
+   * @param \Drupal\Core\Entity\EntityManagerInterface $entityManager
+   *   The entity manager.
+   */
+  public function __construct(EntityManagerInterface $entity_manager, ConfigFactory $config_factory) {
+    $this->configFactory = $config_factory;
+    parent::__construct($entity_manager);
+  }
+
+  /**
    * {@inheritdoc}
    */
   public function convert($value, $definition, $name, array $defaults, Request $request) {
     $entity_type = substr($definition['type'], strlen('entity:'));
     if ($storage = $this->entityManager->getStorageController($entity_type)) {
-      // Enter the override-free context, so we can ensure no overrides are
-      // applied.
-      config_context_enter('config.context.free');
+      // Make sure no overrides are loaded.
+      $this->configFactory->disableOverrides();
       $entity = $storage->load($value);
-      // Leave the override-free context.
-      config_context_leave();
+      $this->configFactory->enableOverrides();
       return $entity;
     }
   }
diff --git a/core/modules/locale/lib/Drupal/locale/Tests/LocaleConfigManagerTest.php b/core/modules/locale/lib/Drupal/locale/Tests/LocaleConfigManagerTest.php
index af87dc9..16fc30b 100644
--- a/core/modules/locale/lib/Drupal/locale/Tests/LocaleConfigManagerTest.php
+++ b/core/modules/locale/lib/Drupal/locale/Tests/LocaleConfigManagerTest.php
@@ -47,7 +47,8 @@ public function testHasTranslation() {
       $this->container->get('config.storage.schema'),
       $this->container->get('config.storage.installer'),
       $this->container->get('locale.storage'),
-      $this->container->get('cache.config')
+      $this->container->get('cache.config'),
+      $this->container->get('config.factory')
     );
 
     $language = new Language(array('id' => 'de'));
diff --git a/core/modules/locale/lib/Drupal/locale/Tests/LocaleConfigTranslationTest.php b/core/modules/locale/lib/Drupal/locale/Tests/LocaleConfigTranslationTest.php
index 0970b9c..f7c64bf 100644
--- a/core/modules/locale/lib/Drupal/locale/Tests/LocaleConfigTranslationTest.php
+++ b/core/modules/locale/lib/Drupal/locale/Tests/LocaleConfigTranslationTest.php
@@ -89,7 +89,6 @@ function testConfigTranslation() {
     $translation = $wrapper->getTranslation($langcode);
     $properties = $translation->getProperties();
     $this->assertEqual(count($properties), 1, 'Got the right number of properties after translation');
-//    $this->assertEqual($properties['name']->getValue(), $site_name, 'Got the right translation for site name after translation');
 
     // Check the translated site name is displayed.
     $this->drupalGet($langcode);
@@ -172,14 +171,15 @@ function testConfigTranslation() {
     $this->assertEqual($property->getValue(), $image_style_label, 'Got the right translation for image style name after translation');
 
     // Quick test to ensure translation file exists.
-    $this->assertEqual(\Drupal::config('locale.config.xx.image.style.medium')->get('label'), $image_style_label);
+    $language_config_name = \Drupal::configFactory()->getLanguageConfigName('xx', 'image.style.medium');
+    $this->assertEqual(\Drupal::config($language_config_name)->get('label'), $image_style_label);
 
     // Uninstall the module.
     $this->drupalPostForm('admin/modules/uninstall', array('uninstall[image]' => "image"), t('Uninstall'));
     $this->drupalPostForm(NULL, array(), t('Uninstall'));
 
     // Ensure that the translated configuration has been removed.
-    $this->assertFalse(\Drupal::config('locale.config.xx.image.style.medium')->get('label'), 'Translated configuration for image module removed.');
+    $this->assertFalse(\Drupal::config($language_config_name)->get('label'), 'Translated configuration for image module removed.');
 
     // Translate default category using the UI so configuration is refreshed.
     $category_label = $this->randomName(20);
diff --git a/core/modules/locale/lib/Drupal/locale/Tests/LocaleTranslationUiTest.php b/core/modules/locale/lib/Drupal/locale/Tests/LocaleTranslationUiTest.php
index d02f763..5c67d4e 100644
--- a/core/modules/locale/lib/Drupal/locale/Tests/LocaleTranslationUiTest.php
+++ b/core/modules/locale/lib/Drupal/locale/Tests/LocaleTranslationUiTest.php
@@ -109,7 +109,8 @@ function testStringTranslation() {
     );
     $this->drupalPostForm('admin/config/regional/translate', $edit, t('Save translations'));
     $this->assertText(t('The strings have been saved.'), 'The strings have been saved.');
-    $this->assertEqual($this->getUrl(), url('admin/config/regional/translate', array('absolute' => TRUE)), 'Correct page redirection.');
+    $url_bits = explode('?', $this->getUrl());
+    $this->assertEqual($url_bits[0], url('admin/config/regional/translate', array('absolute' => TRUE)), 'Correct page redirection.');
     $search = array(
       'string' => $name,
       'langcode' => $langcode,
diff --git a/core/modules/locale/locale.install b/core/modules/locale/locale.install
index 5c98791..960381c 100644
--- a/core/modules/locale/locale.install
+++ b/core/modules/locale/locale.install
@@ -947,9 +947,9 @@ function locale_update_8016() {
   // Fetch all date types from {date_format_type}.
   $result = db_query('SELECT * FROM {date_format_locale}');
   foreach ($result as $format) {
-    $language = $format->language;
     // Create config objects for the language if not yet done.
-    \Drupal::config("locale.config.$language.system.date_format." . $format->type)
+    $config_name = \Drupal::configFactory()->getLanguageConfigName($format->language, 'system.date_format.' . $format->type);
+    \Drupal::config($config_name)
       ->set('pattern.php', $format->format)
       ->save();
   }
diff --git a/core/modules/locale/locale.services.yml b/core/modules/locale/locale.services.yml
index 568f21d..b5f4cf4 100644
--- a/core/modules/locale/locale.services.yml
+++ b/core/modules/locale/locale.services.yml
@@ -1,17 +1,12 @@
 services:
-  locale_config_subscriber:
-    class: Drupal\locale\LocaleConfigSubscriber
-    tags:
-      - { name: event_subscriber }
-    arguments: ['@language_manager', '@config.context']
   paramconverter.configentity_admin:
     class: Drupal\locale\ParamConverter\LocaleAdminPathConfigEntityConverter
     tags:
       - { name: paramconverter, priority: 5 }
-    arguments: ['@entity.manager']
+    arguments: ['@entity.manager', '@config.factory']
   locale.config.typed:
     class: Drupal\locale\LocaleConfigManager
-    arguments: ['@config.storage', '@config.storage.schema', '@config.storage.installer', '@locale.storage', '@cache.config']
+    arguments: ['@config.storage', '@config.storage.schema', '@config.storage.installer', '@locale.storage', '@cache.config', '@config.factory']
   locale.storage:
     class: Drupal\locale\StringDatabaseStorage
     arguments: ['@database']
diff --git a/core/modules/locale/tests/modules/locale_test/config/locale.config.de.locale_test.translation.yml b/core/modules/locale/tests/modules/locale_test/config/language.config.de.locale_test.translation.yml
similarity index 100%
rename from core/modules/locale/tests/modules/locale_test/config/locale.config.de.locale_test.translation.yml
rename to core/modules/locale/tests/modules/locale_test/config/language.config.de.locale_test.translation.yml
diff --git a/core/modules/migrate_drupal/lib/Drupal/migrate_drupal/Tests/d6/MigrateSystemConfigsTest.php b/core/modules/migrate_drupal/lib/Drupal/migrate_drupal/Tests/d6/MigrateSystemConfigsTest.php
index 0367775..36b0fa6 100644
--- a/core/modules/migrate_drupal/lib/Drupal/migrate_drupal/Tests/d6/MigrateSystemConfigsTest.php
+++ b/core/modules/migrate_drupal/lib/Drupal/migrate_drupal/Tests/d6/MigrateSystemConfigsTest.php
@@ -181,11 +181,11 @@ public function testSystemFile() {
     $this->prepare($migration, $dumps);
     $executable = new MigrateExecutable($migration, new MigrateMessage());
     $executable->import();
-    config_context_enter('config.context.free');
+    \Drupal::configFactory()->disableOverrides();
     $config = \Drupal::config('system.file');
     $this->assertIdentical($config->get('path.private'), 'files/test');
     $this->assertIdentical($config->get('path.temporary'), 'files/temp');
-    config_context_leave();
+    \Drupal::configFactory()->enableOverrides();
   }
 
 }
diff --git a/core/modules/search/lib/Drupal/search/Form/SearchSettingsForm.php b/core/modules/search/lib/Drupal/search/Form/SearchSettingsForm.php
index 0d3e115..d0acb03 100644
--- a/core/modules/search/lib/Drupal/search/Form/SearchSettingsForm.php
+++ b/core/modules/search/lib/Drupal/search/Form/SearchSettingsForm.php
@@ -8,7 +8,6 @@
 
 use Drupal\Core\Cache\Cache;
 use Drupal\Core\Config\ConfigFactory;
-use Drupal\Core\Config\Context\ContextInterface;
 use Drupal\Core\Extension\ModuleHandlerInterface;
 use Drupal\Core\KeyValueStore\StateInterface;
 use Drupal\Core\Plugin\PluginFormInterface;
@@ -54,8 +53,6 @@ class SearchSettingsForm extends ConfigFormBase {
    *
    * @param \Drupal\Core\Config\ConfigFactory $config_factory
    *   The configuration factory object that manages search settings.
-   * @param \Drupal\Core\Config\Context\ContextInterface $context
-   *   The context interface
    * @param \Drupal\search\SearchPluginManager $manager
    *   The manager for search plugins.
    * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
@@ -63,8 +60,8 @@ class SearchSettingsForm extends ConfigFormBase {
    * @param \Drupal\Core\KeyValueStore\StateInterface $state
    *   The state key/value store interface, gives access to state based config settings.
    */
-  public function __construct(ConfigFactory $config_factory, ContextInterface $context, SearchPluginManager $manager, ModuleHandlerInterface $module_handler, StateInterface $state) {
-    parent::__construct($config_factory, $context);
+  public function __construct(ConfigFactory $config_factory, SearchPluginManager $manager, ModuleHandlerInterface $module_handler, StateInterface $state) {
+    parent::__construct($config_factory);
     $this->searchSettings = $config_factory->get('search.settings');
     $this->searchPluginManager = $manager;
     $this->moduleHandler = $module_handler;
@@ -77,7 +74,6 @@ public function __construct(ConfigFactory $config_factory, ContextInterface $con
   public static function create(ContainerInterface $container) {
     return new static(
       $container->get('config.factory'),
-      $container->get('config.context.free'),
       $container->get('plugin.manager.search'),
       $container->get('module_handler'),
       $container->get('state')
diff --git a/core/modules/statistics/lib/Drupal/statistics/StatisticsSettingsForm.php b/core/modules/statistics/lib/Drupal/statistics/StatisticsSettingsForm.php
index e8646cd..2f4d9f7 100644
--- a/core/modules/statistics/lib/Drupal/statistics/StatisticsSettingsForm.php
+++ b/core/modules/statistics/lib/Drupal/statistics/StatisticsSettingsForm.php
@@ -6,7 +6,6 @@
 
 namespace Drupal\statistics;
 
-use Drupal\Core\Config\Context\ContextInterface;
 use Drupal\Core\Extension\ModuleHandlerInterface;
 use Drupal\Core\Form\ConfigFormBase;
 use Drupal\Core\Config\ConfigFactory;
@@ -29,13 +28,11 @@ class StatisticsSettingsForm extends ConfigFormBase {
    *
    * @param \Drupal\Core\Config\ConfigFactory $config_factory
    *   The factory for configuration objects.
-   * @param \Drupal\Core\Config\Context\ContextInterface $context
-   *   The configuration context to use.
    * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
    *   The module handler.
    */
-  public function __construct(ConfigFactory $config_factory, ContextInterface $context, ModuleHandlerInterface $module_handler) {
-    parent::__construct($config_factory, $context);
+  public function __construct(ConfigFactory $config_factory, ModuleHandlerInterface $module_handler) {
+    parent::__construct($config_factory);
 
     $this->moduleHandler = $module_handler;
   }
@@ -46,7 +43,6 @@ public function __construct(ConfigFactory $config_factory, ContextInterface $con
   public static function create(ContainerInterface $container) {
     return new static(
       $container->get('config.factory'),
-      $container->get('config.context.free'),
       $container->get('module_handler')
     );
   }
@@ -95,5 +91,5 @@ public function submitForm(array &$form, array &$form_state) {
 
     parent::submitForm($form, $form_state);
   }
-
 }
+
diff --git a/core/modules/system/lib/Drupal/system/Form/CronForm.php b/core/modules/system/lib/Drupal/system/Form/CronForm.php
index 5d94762..6a070e0 100644
--- a/core/modules/system/lib/Drupal/system/Form/CronForm.php
+++ b/core/modules/system/lib/Drupal/system/Form/CronForm.php
@@ -8,7 +8,6 @@
 namespace Drupal\system\Form;
 
 use Drupal\Core\Config\ConfigFactory;
-use Drupal\Core\Config\Context\ContextInterface;
 use Drupal\Core\KeyValueStore\StateInterface;
 use Drupal\Core\Form\ConfigFormBase;
 use Symfony\Component\DependencyInjection\ContainerInterface;
@@ -31,13 +30,11 @@ class CronForm extends ConfigFormBase {
    *
    * @param \Drupal\Core\Config\ConfigFactory $config_factory
    *   The factory for configuration objects.
-   * @param \Drupal\Core\Config\Context\ContextInterface $context
-   *   The configuration context used for this configuration object.
    * @param \Drupal\Core\KeyValueStore\StateInterface $state
-   *   The state key value store.
+   *   The state keyvalue collection to use.
    */
-  public function __construct(ConfigFactory $config_factory, ContextInterface $context, StateInterface $state) {
-    parent::__construct($config_factory, $context);
+  public function __construct(ConfigFactory $config_factory, StateInterface $state) {
+    parent::__construct($config_factory);
     $this->state = $state;
   }
 
@@ -47,7 +44,6 @@ public function __construct(ConfigFactory $config_factory, ContextInterface $con
   public static function create(ContainerInterface $container) {
     return new static(
       $container->get('config.factory'),
-      $container->get('config.context.free'),
       $container->get('state')
     );
   }
diff --git a/core/modules/system/lib/Drupal/system/Form/ImageToolkitForm.php b/core/modules/system/lib/Drupal/system/Form/ImageToolkitForm.php
index 1600b58..1ab3a26 100644
--- a/core/modules/system/lib/Drupal/system/Form/ImageToolkitForm.php
+++ b/core/modules/system/lib/Drupal/system/Form/ImageToolkitForm.php
@@ -8,7 +8,6 @@
 namespace Drupal\system\Form;
 
 use Drupal\Core\Config\ConfigFactory;
-use Drupal\Core\Config\Context\ContextInterface;
 use Drupal\Core\Form\ConfigFormBase;
 use Drupal\Core\ImageToolkit\ImageToolkitManager;
 use Symfony\Component\DependencyInjection\ContainerInterface;
@@ -30,13 +29,11 @@ class ImageToolkitForm extends ConfigFormBase {
    *
    * @param \Drupal\Core\Config\ConfigFactory $config_factory
    *   The factory for configuration objects.
-   * @param \Drupal\Core\Config\Context\ContextInterface $context
-   *   The configuration context used for this configuration object.
    * @param \Drupal\Core\ImageToolkit\ImageToolkitManager $manager
    *   The image toolkit plugin manager.
    */
-  public function __construct(ConfigFactory $config_factory, ContextInterface $context, ImageToolkitManager $manager) {
-    parent::__construct($config_factory, $context);
+  public function __construct(ConfigFactory $config_factory, ImageToolkitManager $manager) {
+    parent::__construct($config_factory);
 
     foreach ($manager->getAvailableToolkits() as $id => $definition) {
       $this->availableToolkits[$id] = $manager->createInstance($id);
@@ -49,7 +46,6 @@ public function __construct(ConfigFactory $config_factory, ContextInterface $con
   public static function create(ContainerInterface $container) {
     return new static(
       $container->get('config.factory'),
-      $container->get('config.context.free'),
       $container->get('image.toolkit.manager')
     );
   }
diff --git a/core/modules/system/lib/Drupal/system/Form/PerformanceForm.php b/core/modules/system/lib/Drupal/system/Form/PerformanceForm.php
index f596078..cc114bf 100644
--- a/core/modules/system/lib/Drupal/system/Form/PerformanceForm.php
+++ b/core/modules/system/lib/Drupal/system/Form/PerformanceForm.php
@@ -9,7 +9,6 @@
 
 use Drupal\Core\Form\ConfigFormBase;
 use Drupal\Core\Config\ConfigFactory;
-use Drupal\Core\Config\Context\ContextInterface;
 use Drupal\Core\Cache\CacheBackendInterface;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
@@ -30,12 +29,10 @@ class PerformanceForm extends ConfigFormBase {
    *
    * @param \Drupal\Core\Config\ConfigFactory $config_factory
    *   The factory for configuration objects.
-   * @param \Drupal\Core\Config\Context\ContextInterface $context
-   *   The configuration context used for this configuration object.
    * @param \Drupal\Core\Cache\CacheBackendInterface $page_cache
    */
-  public function __construct(ConfigFactory $config_factory, ContextInterface $context, CacheBackendInterface $page_cache) {
-    parent::__construct($config_factory, $context);
+  public function __construct(ConfigFactory $config_factory, CacheBackendInterface $page_cache) {
+    parent::__construct($config_factory);
 
     $this->pageCache = $page_cache;
   }
@@ -46,7 +43,6 @@ public function __construct(ConfigFactory $config_factory, ContextInterface $con
   public static function create(ContainerInterface $container) {
     return new static(
       $container->get('config.factory'),
-      $container->get('config.context.free'),
       $container->get('cache.page')
     );
   }
diff --git a/core/modules/system/lib/Drupal/system/Form/RegionalForm.php b/core/modules/system/lib/Drupal/system/Form/RegionalForm.php
index a75ff7f..2ca6acf 100644
--- a/core/modules/system/lib/Drupal/system/Form/RegionalForm.php
+++ b/core/modules/system/lib/Drupal/system/Form/RegionalForm.php
@@ -8,7 +8,6 @@
 namespace Drupal\system\Form;
 
 use Drupal\Core\Config\ConfigFactory;
-use Drupal\Core\Config\Context\ContextInterface;
 use Drupal\Core\Locale\CountryManagerInterface;
 use Drupal\Core\Form\ConfigFormBase;
 use Symfony\Component\DependencyInjection\ContainerInterface;
@@ -30,13 +29,11 @@ class RegionalForm extends ConfigFormBase {
    *
    * @param \Drupal\Core\Config\ConfigFactory $config_factory
    *   The factory for configuration objects.
-   * @param \Drupal\Core\Config\Context\ContextInterface $context
-   *   The configuration context used for this configuration object.
    * @param \Drupal\Core\Locale\CountryManagerInterface $country_manager
    *   The country manager.
    */
-  public function __construct(ConfigFactory $config_factory, ContextInterface $context, CountryManagerInterface $country_manager) {
-    parent::__construct($config_factory, $context);
+  public function __construct(ConfigFactory $config_factory, CountryManagerInterface $country_manager) {
+    parent::__construct($config_factory);
     $this->countryManager = $country_manager;
   }
 
@@ -46,7 +43,6 @@ public function __construct(ConfigFactory $config_factory, ContextInterface $con
   public static function create(ContainerInterface $container) {
     return new static(
       $container->get('config.factory'),
-      $container->get('config.context.free'),
       $container->get('country_manager')
     );
   }
diff --git a/core/modules/system/lib/Drupal/system/Form/SiteInformationForm.php b/core/modules/system/lib/Drupal/system/Form/SiteInformationForm.php
index 34e3584..aca83c3 100644
--- a/core/modules/system/lib/Drupal/system/Form/SiteInformationForm.php
+++ b/core/modules/system/lib/Drupal/system/Form/SiteInformationForm.php
@@ -8,7 +8,6 @@
 namespace Drupal\system\Form;
 
 use Drupal\Core\Config\ConfigFactory;
-use Drupal\Core\Config\Context\ContextInterface;
 use Drupal\Core\Path\AliasManagerInterface;
 use Drupal\Core\Form\ConfigFormBase;
 use Symfony\Component\DependencyInjection\ContainerInterface;
@@ -30,13 +29,11 @@ class SiteInformationForm extends ConfigFormBase {
    *
    * @param \Drupal\Core\Config\ConfigFactory $config_factory
    *   The factory for configuration objects.
-   * @param \Drupal\Core\Config\Context\ContextInterface $context
-   *   The configuration context used for this configuration object.
    * @param \Drupal\Core\Path\AliasManagerInterface $alias_manager
    *   The path alias manager.
    */
-  public function __construct(ConfigFactory $config_factory, ContextInterface $context, AliasManagerInterface $alias_manager) {
-    parent::__construct($config_factory, $context);
+  public function __construct(ConfigFactory $config_factory, AliasManagerInterface $alias_manager) {
+    parent::__construct($config_factory);
 
     $this->aliasManager = $alias_manager;
   }
@@ -47,7 +44,6 @@ public function __construct(ConfigFactory $config_factory, ContextInterface $con
   public static function create(ContainerInterface $container) {
     return new static(
       $container->get('config.factory'),
-      $container->get('config.context.free'),
       $container->get('path.alias_manager')
     );
   }
diff --git a/core/modules/system/lib/Drupal/system/Form/SiteMaintenanceModeForm.php b/core/modules/system/lib/Drupal/system/Form/SiteMaintenanceModeForm.php
index 693dc28..535ecfd 100644
--- a/core/modules/system/lib/Drupal/system/Form/SiteMaintenanceModeForm.php
+++ b/core/modules/system/lib/Drupal/system/Form/SiteMaintenanceModeForm.php
@@ -8,7 +8,6 @@
 namespace Drupal\system\Form;
 
 use Drupal\Core\Config\ConfigFactory;
-use Drupal\Core\Config\Context\ContextInterface;
 use Drupal\Core\KeyValueStore\StateInterface;
 use Drupal\Core\Form\ConfigFormBase;
 use Symfony\Component\DependencyInjection\ContainerInterface;
@@ -30,13 +29,11 @@ class SiteMaintenanceModeForm extends ConfigFormBase {
    *
    * @param \Drupal\Core\Config\ConfigFactory $config_factory
    *   The factory for configuration objects.
-   * @param \Drupal\Core\Config\Context\ContextInterface $context
-   *   The configuration context to use.
    * @param \Drupal\Core\KeyValueStore\StateInterface $state
    *   The state keyvalue collection to use.
    */
-  public function __construct(ConfigFactory $config_factory, ContextInterface $context, StateInterface $state) {
-    parent::__construct($config_factory, $context);
+  public function __construct(ConfigFactory $config_factory, StateInterface $state) {
+    parent::__construct($config_factory);
     $this->state = $state;
   }
 
@@ -46,7 +43,6 @@ public function __construct(ConfigFactory $config_factory, ContextInterface $con
   public static function create(ContainerInterface $container) {
     return new static(
       $container->get('config.factory'),
-      $container->get('config.context.free'),
       $container->get('state')
     );
   }
diff --git a/core/modules/system/lib/Drupal/system/Form/ThemeSettingsForm.php b/core/modules/system/lib/Drupal/system/Form/ThemeSettingsForm.php
index ec76227..dc1490a 100644
--- a/core/modules/system/lib/Drupal/system/Form/ThemeSettingsForm.php
+++ b/core/modules/system/lib/Drupal/system/Form/ThemeSettingsForm.php
@@ -12,7 +12,6 @@
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
 use Drupal\Core\Cache\Cache;
 use Drupal\Core\Config\ConfigFactory;
-use Drupal\Core\Config\Context\ContextInterface;
 use Drupal\Core\Extension\ModuleHandlerInterface;
 use Drupal\Core\Form\ConfigFormBase;
 
@@ -33,13 +32,11 @@ class ThemeSettingsForm extends ConfigFormBase {
    *
    * @param \Drupal\Core\Config\ConfigFactory $config_factory
    *   The factory for configuration objects.
-   * @param \Drupal\Core\Config\Context\ContextInterface $context
-   *   The configuration context to use.
    * @param \Drupal\Core\Extension\ModuleHandlerInterface
    *   The module handler instance to use.
    */
-  public function __construct(ConfigFactory $config_factory, ContextInterface $context, ModuleHandlerInterface $module_handler) {
-    parent::__construct($config_factory, $context);
+  public function __construct(ConfigFactory $config_factory, ModuleHandlerInterface $module_handler) {
+    parent::__construct($config_factory);
 
     $this->moduleHandler = $module_handler;
   }
@@ -50,7 +47,6 @@ public function __construct(ConfigFactory $config_factory, ContextInterface $con
   public static function create(ContainerInterface $container) {
     return new static(
       $container->get('config.factory'),
-      $container->get('config.context.free'),
       $container->get('module_handler')
     );
   }
diff --git a/core/modules/system/lib/Drupal/system/SystemConfigSubscriber.php b/core/modules/system/lib/Drupal/system/SystemConfigSubscriber.php
index f9965f9..237473a 100644
--- a/core/modules/system/lib/Drupal/system/SystemConfigSubscriber.php
+++ b/core/modules/system/lib/Drupal/system/SystemConfigSubscriber.php
@@ -9,8 +9,6 @@
 use Drupal\Core\Config\Config;
 use Drupal\Core\Config\ConfigImporterEvent;
 use Drupal\Core\Config\ConfigImporterException;
-use Drupal\Core\Config\Context\ConfigContext;
-use Drupal\Core\Config\Context\ContextInterface;
 use Drupal\Core\Config\ConfigEvent;
 use Drupal\Core\Config\StorageDispatcher;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
diff --git a/core/modules/system/lib/Drupal/system/Tests/Menu/MenuRouterRebuildTest.php b/core/modules/system/lib/Drupal/system/Tests/Menu/MenuRouterRebuildTest.php
index 849c1ef..7cb4df5 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Menu/MenuRouterRebuildTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Menu/MenuRouterRebuildTest.php
@@ -48,8 +48,7 @@ function setUp() {
    */
   public function testMenuRouterRebuildContext() {
     // Enter a language context before rebuilding the menu router tables.
-    $language_context = config_context_enter('Drupal\Core\Config\Context\LanguageConfigContext');
-    $language_context->setLanguage(language_load('nl'));
+    \Drupal::configFactory()->setLanguage(language_load('nl'));
     menu_router_rebuild();
 
     // Check that the language context was not used for building the menu item.
diff --git a/core/modules/system/tests/modules/menu_test/config/locale.config.nl.menu_test.menu_item.yml b/core/modules/system/tests/modules/menu_test/config/language.config.nl.menu_test.menu_item.yml
similarity index 100%
rename from core/modules/system/tests/modules/menu_test/config/locale.config.nl.menu_test.menu_item.yml
rename to core/modules/system/tests/modules/menu_test/config/language.config.nl.menu_test.menu_item.yml
diff --git a/core/modules/tour/tests/tour_test/config/locale.config.it.tour.tour.tour-test.yml b/core/modules/tour/tests/tour_test/config/language.config.it.tour.tour.tour-test.yml
similarity index 100%
rename from core/modules/tour/tests/tour_test/config/locale.config.it.tour.tour.tour-test.yml
rename to core/modules/tour/tests/tour_test/config/language.config.it.tour.tour.tour-test.yml
diff --git a/core/modules/user/lib/Drupal/user/AccountSettingsForm.php b/core/modules/user/lib/Drupal/user/AccountSettingsForm.php
index ace1834..20ae102 100644
--- a/core/modules/user/lib/Drupal/user/AccountSettingsForm.php
+++ b/core/modules/user/lib/Drupal/user/AccountSettingsForm.php
@@ -9,7 +9,6 @@
 
 use Drupal\Core\Form\ConfigFormBase;
 use Drupal\Core\Config\ConfigFactory;
-use Drupal\Core\Config\Context\ContextInterface;
 use Drupal\Core\Extension\ModuleHandler;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
@@ -30,13 +29,11 @@ class AccountSettingsForm extends ConfigFormBase {
    *
    * @param \Drupal\Core\Config\ConfigFactory $config_factory
    *   The factory for configuration objects.
-   * @param \Drupal\Core\Config\Context\ContextInterface $context
-   *   The configuration context.
    * @param \Drupal\Core\Extension\ModuleHandler $module_handler
    *   The module handler.
    */
-  public function __construct(ConfigFactory $config_factory, ContextInterface $context, ModuleHandler $module_handler) {
-    parent::__construct($config_factory, $context);
+  public function __construct(ConfigFactory $config_factory, ModuleHandler $module_handler) {
+    parent::__construct($config_factory);
     $this->moduleHandler = $module_handler;
   }
 
@@ -46,7 +43,6 @@ public function __construct(ConfigFactory $config_factory, ContextInterface $con
   public static function create(ContainerInterface $container) {
     return new static(
       $container->get('config.factory'),
-      $container->get('config.context.free'),
       $container->get('module_handler')
     );
   }
diff --git a/core/modules/user/lib/Drupal/user/UserConfigContext.php b/core/modules/user/lib/Drupal/user/UserConfigContext.php
deleted file mode 100644
index 1d5f497..0000000
--- a/core/modules/user/lib/Drupal/user/UserConfigContext.php
+++ /dev/null
@@ -1,45 +0,0 @@
-<?php
-
-/**
- * @file
- * Contains \Drupal\user\UserConfigContext.
- */
-
-namespace Drupal\user;
-
-use Drupal\Core\Config\Context\ConfigContext;
-use Drupal\user\UserInterfaceInterface;
-
-
-/**
- * Defines a configuration context object for a user account.
- *
- * This should be used when configuration objects need a context for a user
- * other than the current user.
- *
- * @see user_mail()
- */
-class UserConfigContext extends ConfigContext {
-
-  /**
-   * Predefined key for account object.
-   */
-  const USER_KEY = 'user.account';
-
-  /**
-   * Creates the configuration context for user accounts.
-   *
-   * @param \Drupal\user\UserInterface $account
-   *   The account to add to the config context.
-   *
-   * @return \Drupal\user\UserConfigContext
-   *   The user config context object.
-   */
-  public function setAccount(UserInterface $account) {
-    $this->set(self::USER_KEY, $account);
-    // Re-initialize since the user change changes the context fundamentally.
-    $this->init();
-    return $this;
-  }
-
-}
diff --git a/core/modules/user/user.module b/core/modules/user/user.module
index f6a30cb..28e1872 100644
--- a/core/modules/user/user.module
+++ b/core/modules/user/user.module
@@ -1339,12 +1339,10 @@ function user_mail($key, &$message, $params) {
   $langcode = $message['langcode'];
   $variables = array('user' => $params['account']);
 
-  // Get configuration objects customized for the user specified in $params as
-  // this user is not necessarily the same as the one triggering the mail. This
-  // allows the configuration objects to be localized for the user's language if
-  // the locale module is enabled.
-  $user_config_context = config_context_enter('Drupal\user\UserConfigContext');
-  $user_config_context->setAccount($params['account']);
+  $original_language = \Drupal::configFactory()->getLanguage();
+
+  $language = language_load($params['account']->getPreferredLangcode());
+  \Drupal::configFactory()->setLanguage($language);
   $mail_config = \Drupal::config('user.mail');
 
    // We do not sanitize the token replacement, since the output of this
@@ -1353,8 +1351,7 @@ function user_mail($key, &$message, $params) {
   $message['subject'] .= $token_service->replace($mail_config->get($key . '.subject'), $variables, $token_options);
   $message['body'][] = $token_service->replace($mail_config->get($key . '.body'), $variables, $token_options);
 
-  // Return the previous config context.
-  config_context_leave();
+  \Drupal::configFactory()->setLanguage($original_language);
 }
 
 /**
diff --git a/core/tests/Drupal/Tests/Core/Datetime/DateTest.php b/core/tests/Drupal/Tests/Core/Datetime/DateTest.php
index 32d2103..55f2471 100644
--- a/core/tests/Drupal/Tests/Core/Datetime/DateTest.php
+++ b/core/tests/Drupal/Tests/Core/Datetime/DateTest.php
@@ -65,7 +65,7 @@ protected function setUp() {
       ->getMock();
     $this->stringTranslation = $this->getMock('Drupal\Core\StringTranslation\TranslationInterface');
 
-    $this->date = new Date($this->entityManager, $this->languageManager, $this->stringTranslation);
+    $this->date = new Date($this->entityManager, $this->languageManager, $this->stringTranslation, $this->getConfigFactoryStub());
   }
 
   /**