diff --git a/core/lib/Drupal/Core/Form/FormBase.php b/core/lib/Drupal/Core/Form/FormBase.php
new file mode 100644
index 0000000..cba8a8f
--- /dev/null
+++ b/core/lib/Drupal/Core/Form/FormBase.php
@@ -0,0 +1,76 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Core\Form\FormBase.
+ */
+
+namespace Drupal\Core\Form;
+
+use Drupal\Core\Routing\PathBasedGeneratorInterface;
+use Drupal\Core\StringTranslation\Translator\TranslatorInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\HttpFoundation\RedirectResponse;
+
+/**
+ * Provides a base class for forms.
+ */
+abstract class FormBase implements FormInterface {
+
+  /**
+   * The translation manager service.
+   *
+   * @var \Drupal\Core\StringTranslation\Translator\TranslatorInterface
+   */
+  protected $translationManager;
+
+  /**
+   * Constructs the FormBase object.
+   *
+   * @param \Drupal\Core\StringTranslation\Translator\TranslatorInterface $translation_manager
+   *   The translation manager.
+   */
+  public function __construct(TranslatorInterface $translation_manager) {
+    $this->translationManager = $translation_manager;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static(
+      $container->get('string_translation')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function validateForm(array &$form, array &$form_state) {
+    // Validation is optional.
+  }
+
+  /**
+   * Translates a string to the current language or to a given language using
+   * the string translation service.
+   *
+   * @param string $string
+   *   A string containing the English string to translate.
+   * @param array $args
+   *   An associative array of replacements to make after translation. Based
+   *   on the first character of the key, the value is escaped and/or themed.
+   *   See \Drupal\Core\Utility\String::format() for details.
+   * @param array $options
+   *   An associative array of additional options, with the following elements:
+   *   - 'langcode': The language code to translate to a language other than
+   *      what is used to display the page.
+   *   - 'context': The context the source string belongs to.
+   *
+   * @return string
+   *   The translated string.
+   */
+  protected function t($string, array $args = array(), array $options = array()) {
+    return $this->translationManager->translate($string, $args, $options);
+  }
+
+}
diff --git a/core/modules/config/lib/Drupal/config/Form/ConfigSync.php b/core/modules/config/lib/Drupal/config/Form/ConfigSync.php
index 8c5cb96..4aa5b7d 100644
--- a/core/modules/config/lib/Drupal/config/Form/ConfigSync.php
+++ b/core/modules/config/lib/Drupal/config/Form/ConfigSync.php
@@ -7,11 +7,9 @@
 
 namespace Drupal\config\Form;
 
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
-use Symfony\Component\DependencyInjection\ContainerInterface;
-
+use Drupal\Core\Entity\EntityManager;
+use Drupal\Core\Form\FormBase;
 use Drupal\Core\Controller\ControllerInterface;
-use Drupal\Core\Form\FormInterface;
 use Drupal\Core\Config\StorageInterface;
 use Drupal\Core\Lock\LockBackendInterface;
 use Drupal\Core\Config\StorageComparer;
@@ -20,12 +18,13 @@
 use Drupal\Core\Config\ConfigFactory;
 use Drupal\Core\StringTranslation\Translator\TranslatorInterface;
 use Drupal\Core\Routing\PathBasedGeneratorInterface;
-use \Drupal\Core\Entity\EntityManager;
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 
 /**
  * Construct the storage changes in a configuration synchronization form.
  */
-class ConfigSync implements ControllerInterface, FormInterface {
+class ConfigSync extends FormBase implements ControllerInterface {
 
   /**
    * The database lock object.
@@ -66,14 +65,6 @@ class ConfigSync implements ControllerInterface, FormInterface {
   protected $entity_manager;
 
   /**
-   * The translation manager service.
-   *
-   * @var \Drupal\Core\StringTranslation\Translator\TranslatorInterface
-   */
-  protected $translationManager;
-
-
-  /**
    * URL generator service.
    *
    * @var \Drupal\Core\Routing\PathBasedGeneratorInterface
@@ -83,8 +74,6 @@ class ConfigSync implements ControllerInterface, FormInterface {
   /**
    * Constructs the object.
    *
-   * @param \Drupal\Core\Database\Connection; $database
-   *   The database object.
    * @param \Drupal\Core\Config\StorageInterface $sourceStorage
    *   The source storage object.
    * @param \Drupal\Core\Config\StorageInterface $targetStorage
@@ -95,21 +84,22 @@ class ConfigSync implements ControllerInterface, FormInterface {
    *   Event dispatcher.
    * @param \Drupal\Core\Config\ConfigFactory $config_factory
    *   Configuration object factory.
-   * @param \Drupal\Core\Entity\EntityManager
+   * @param \Drupal\Core\Entity\EntityManager $entity_manager
    *   Entity manager.
    * @param \Drupal\Core\StringTranslation\Translator\TranslatorInterface $translation_manager
    *   The translation manager.
    * @param \Drupal\Core\Routing\PathBasedGeneratorInterface $url_generator
    *   The url generator service.
    */
-  public function __construct(StorageInterface $sourceStorage, StorageInterface $targetStorage, LockBackendInterface $lock, EventDispatcherInterface $event_dispatcher, ConfigFactory $config_factory, EntityManager $entity_manger, TranslatorInterface $translation_manager, PathBasedGeneratorInterface $url_generator) {
+  public function __construct(StorageInterface $sourceStorage, StorageInterface $targetStorage, LockBackendInterface $lock, EventDispatcherInterface $event_dispatcher, ConfigFactory $config_factory, EntityManager $entity_manager, TranslatorInterface $translation_manager, PathBasedGeneratorInterface $url_generator) {
+    parent::__construct($translation_manager);
+
     $this->sourceStorage = $sourceStorage;
     $this->targetStorage = $targetStorage;
     $this->lock = $lock;
     $this->eventDispatcher = $event_dispatcher;
     $this->configFactory = $config_factory;
-    $this->entity_manager = $entity_manger;
-    $this->translationManager = $translation_manager;
+    $this->entity_manager = $entity_manager;
     $this->urlGenerator = $url_generator;
   }
 
@@ -143,14 +133,14 @@ public function buildForm(array $form, array &$form_state) {
     $form['actions'] = array('#type' => 'actions');
     $form['actions']['submit'] = array(
       '#type' => 'submit',
-      '#value' => $this->translationManager->translate('Import all'),
+      '#value' => $this->t('Import all'),
     );
 
     $source_list = $this->sourceStorage->listAll();
     $config_comparer = new StorageComparer($this->sourceStorage, $this->targetStorage);
     if (empty($source_list) || !$config_comparer->createChangelist()->hasChanges()) {
       $form['no_changes'] = array(
-        '#markup' => $this->translationManager->translate('There are no configuration changes.'),
+        '#markup' => $this->t('There are no configuration changes.'),
       );
       $form['actions']['#access'] = FALSE;
       return $form;
@@ -194,7 +184,7 @@ public function buildForm(array $form, array &$form_state) {
 
       foreach ($config_files as $config_file) {
         $links['view_diff'] = array(
-          'title' => $this->translationManager->translate('View differences'),
+          'title' => $this->t('View differences'),
           'href' => $this->urlGenerator->getPathFromRoute('config_diff', array('config_file' => $config_file)),
           'attributes' => array(
             'class' => array('use-ajax'),
@@ -222,12 +212,6 @@ public function buildForm(array $form, array &$form_state) {
   /**
    * {@inheritdoc}
    */
-  public function validateForm(array &$form, array &$form_state) {
-  }
-
-  /**
-   * {@inheritdoc}
-   */
   public function submitForm(array &$form, array &$form_state) {
     $config_importer = new ConfigImporter(
       $form_state['storage_comparer'],
@@ -237,13 +221,13 @@ public function submitForm(array &$form, array &$form_state) {
       $this->lock
     );
     if ($config_importer->alreadyImporting()) {
-      drupal_set_message($this->translationManager->translate('Another request may be synchronizing configuration already.'));
+      drupal_set_message($this->t('Another request may be synchronizing configuration already.'));
     }
     else{
       try {
         $config_importer->import();
         drupal_flush_all_caches();
-        drupal_set_message($this->translationManager->translate('The configuration was imported successfully.'));
+        drupal_set_message($this->t('The configuration was imported successfully.'));
       }
       catch (ConfigException $e) {
         // Return a negative result for UI purposes. We do not differentiate
@@ -252,7 +236,7 @@ public function submitForm(array &$form, array &$form_state) {
         // multiple developers or site builders attempt to do it without
         // coordinating.
         watchdog_exception('config_import', $e);
-        drupal_set_message($this->translationManager->translate('The import failed due to an error. Any errors have been logged.'), 'error');
+        drupal_set_message($this->t('The import failed due to an error. Any errors have been logged.'), 'error');
       }
     }
   }
diff --git a/core/modules/system/lib/Drupal/system/Form/ModulesListForm.php b/core/modules/system/lib/Drupal/system/Form/ModulesListForm.php
index c699c09..8738850 100644
--- a/core/modules/system/lib/Drupal/system/Form/ModulesListForm.php
+++ b/core/modules/system/lib/Drupal/system/Form/ModulesListForm.php
@@ -9,9 +9,9 @@
 
 use Drupal\Core\Controller\ControllerInterface;
 use Drupal\Core\Extension\ModuleHandlerInterface;
-use Drupal\Core\Form\FormInterface;
-use Drupal\Core\KeyValueStore\KeyValueExpirableFactory;
+use Drupal\Core\Form\FormBase;
 use Drupal\Core\KeyValueStore\KeyValueStoreExpirableInterface;
+use Drupal\Core\Routing\PathBasedGeneratorInterface;
 use Drupal\Core\StringTranslation\TranslationManager;
 use Drupal\Component\Utility\Unicode;
 use Symfony\Component\DependencyInjection\ContainerInterface;
@@ -25,7 +25,7 @@
  * requires. See drupal_parse_info_file() for info on module.info.yml
  * descriptors.
  */
-class ModulesListForm implements FormInterface, ControllerInterface {
+class ModulesListForm extends FormBase implements ControllerInterface {
 
   /**
    * The module handler service.
@@ -42,13 +42,6 @@ class ModulesListForm implements FormInterface, ControllerInterface {
   protected $keyValueExpirable;
 
   /**
-   * The translation manager service.
-   *
-   * @var \Drupal\Core\StringTranslation\TranslationManager
-   */
-  protected $translationManager;
-
-  /**
    * The request object.
    *
    * @var \Symfony\Component\HttpFoundation\Request
@@ -77,9 +70,10 @@ public static function create(ContainerInterface $container) {
    *   The translation manager.
    */
   public function __construct(ModuleHandlerInterface $module_handler, KeyValueStoreExpirableInterface $key_value_expirable, TranslationManager $translation_manager) {
+    parent::__construct($translation_manager);
+
     $this->moduleHandler = $module_handler;
     $this->keyValueExpirable = $key_value_expirable;
-    $this->translationManager = $translation_manager;
   }
 
   /**
@@ -111,14 +105,14 @@ public function buildForm(array $form, array &$form_state, Request $request = NU
 
     $form['filters']['text'] = array(
       '#type' => 'search',
-      '#title' => $this->translationManager->translate('Search'),
+      '#title' => $this->t('Search'),
       '#size' => 30,
-      '#placeholder' => $this->translationManager->translate('Enter module name'),
+      '#placeholder' => $this->t('Enter module name'),
       '#attributes' => array(
         'class' => array('table-filter-text'),
         'data-table' => '#system-modules',
         'autocomplete' => 'off',
-        'title' => $this->translationManager->translate('Enter a part of the module name or description to filter by.'),
+        'title' => $this->t('Enter a part of the module name or description to filter by.'),
       ),
     );
 
@@ -139,12 +133,12 @@ public function buildForm(array $form, array &$form_state, Request $request = NU
     foreach (element_children($form['modules']) as $package) {
       $form['modules'][$package] += array(
         '#type' => 'details',
-        '#title' => $this->translationManager->translate($package),
+        '#title' => $this->t($package),
         '#theme' => 'system_modules_details',
         '#header' => array(
-          array('data' => '<span class="visually-hidden">' . $this->translationManager->translate('Enabled') . '</span>', 'class' => array('checkbox')),
-          array('data' => $this->translationManager->translate('Name'), 'class' => array('name')),
-          array('data' => $this->translationManager->translate('Description'), 'class' => array('description', RESPONSIVE_PRIORITY_LOW)),
+          array('data' => '<span class="visually-hidden">' . $this->t('Enabled') . '</span>', 'class' => array('checkbox')),
+          array('data' => $this->t('Name'), 'class' => array('name')),
+          array('data' => $this->t('Description'), 'class' => array('description', RESPONSIVE_PRIORITY_LOW)),
         ),
         '#attributes' => array('class' => array('package-listing')),
         // Ensure that the "Core" package comes first.
@@ -159,7 +153,7 @@ public function buildForm(array $form, array &$form_state, Request $request = NU
     $form['actions'] = array('#type' => 'actions');
     $form['actions']['submit'] = array(
       '#type' => 'submit',
-      '#value' => $this->translationManager->translate('Save configuration'),
+      '#value' => $this->t('Save configuration'),
     );
 
     return $form;
@@ -184,7 +178,7 @@ protected function buildRow(array $modules, $module, $distribution) {
     $row['#required_by'] = array();
 
     $row['name']['#markup'] = $module->info['name'];
-    $row['description']['#markup'] = $this->translationManager->translate($module->info['description']);
+    $row['description']['#markup'] = $this->t($module->info['description']);
     $row['version']['#markup'] = $module->info['version'];
 
     // Add links for each module.
@@ -197,9 +191,9 @@ protected function buildRow(array $modules, $module, $distribution) {
       if ($this->moduleHandler->invoke($module->name, 'help', array("admin/help#$module->name", $help))) {
         $row['links']['help'] = array(
           '#type' => 'link',
-          '#title' => $this->translationManager->translate('Help'),
+          '#title' => $this->t('Help'),
           '#href' => "admin/help/$module->name",
-          '#options' => array('attributes' => array('class' =>  array('module-link', 'module-link-help'), 'title' => $this->translationManager->translate('Help'))),
+          '#options' => array('attributes' => array('class' =>  array('module-link', 'module-link-help'), 'title' => $this->t('Help'))),
         );
       }
     }
@@ -209,9 +203,9 @@ protected function buildRow(array $modules, $module, $distribution) {
     if ($module->status && user_access('administer permissions') && in_array($module->name, $this->moduleHandler->getImplementations('permission'))) {
       $row['links']['permissions'] = array(
         '#type' => 'link',
-        '#title' => $this->translationManager->translate('Permissions'),
+        '#title' => $this->t('Permissions'),
         '#href' => 'admin/people/permissions',
-        '#options' => array('fragment' => 'module-' . $module->name, 'attributes' => array('class' => array('module-link', 'module-link-permissions'), 'title' => $this->translationManager->translate('Configure permissions'))),
+        '#options' => array('fragment' => 'module-' . $module->name, 'attributes' => array('class' => array('module-link', 'module-link-permissions'), 'title' => $this->t('Configure permissions'))),
       );
     }
 
@@ -221,7 +215,7 @@ protected function buildRow(array $modules, $module, $distribution) {
       if (($configure = menu_get_item($module->info['configure'])) && $configure['access']) {
         $row['links']['configure'] = array(
           '#type' => 'link',
-          '#title' => $this->translationManager->translate('Configure'),
+          '#title' => $this->t('Configure'),
           '#href' => $configure['href'],
           '#options' => array('attributes' => array('class' => array('module-link', 'module-link-configure'), 'title' => $configure['description'])),
         );
@@ -231,7 +225,7 @@ protected function buildRow(array $modules, $module, $distribution) {
     // Present a checkbox for installing and indicating the status of a module.
     $row['enable'] = array(
       '#type' => 'checkbox',
-      '#title' => $this->translationManager->translate('Enable'),
+      '#title' => $this->t('Enable'),
       '#default_value' => (bool) $module->status,
     );
 
@@ -249,7 +243,7 @@ protected function buildRow(array $modules, $module, $distribution) {
     // Check the core compatibility.
     if ($module->info['core'] != DRUPAL_CORE_COMPATIBILITY) {
       $compatible = FALSE;
-      $status .= $this->translationManager->translate('This version is not compatible with Drupal !core_version and should be replaced.', array(
+      $status .= $this->t('This version is not compatible with Drupal !core_version and should be replaced.', array(
         '!core_version' => DRUPAL_CORE_COMPATIBILITY,
       ));
     }
@@ -258,7 +252,7 @@ protected function buildRow(array $modules, $module, $distribution) {
     if (version_compare(phpversion(), $module->info['php']) < 0) {
       $compatible = FALSE;
       $required = $module->info['php'] . (substr_count($module->info['php'], '.') < 2 ? '.*' : '');
-      $status .= $this->translationManager->translate('This module requires PHP version @php_required and is incompatible with PHP version !php_version.', array(
+      $status .= $this->t('This module requires PHP version @php_required and is incompatible with PHP version !php_version.', array(
         '@php_required' => $required,
         '!php_version' => phpversion(),
       ));
@@ -276,7 +270,7 @@ protected function buildRow(array $modules, $module, $distribution) {
     // If this module requires other modules, add them to the array.
     foreach ($module->requires as $dependency => $version) {
       if (!isset($modules[$dependency])) {
-        $row['#requires'][$dependency] = $this->translationManager->translate('@module (<span class="admin-missing">missing</span>)', array('@module' => Unicode::ucfirst($dependency)));
+        $row['#requires'][$dependency] = $this->t('@module (<span class="admin-missing">missing</span>)', array('@module' => Unicode::ucfirst($dependency)));
         $row['enable']['#disabled'] = TRUE;
       }
       // Only display visible modules.
@@ -285,7 +279,7 @@ protected function buildRow(array $modules, $module, $distribution) {
         // Disable the module's checkbox if it is incompatible with the
         // dependency's version.
         if ($incompatible_version = drupal_check_incompatibility($version, str_replace(DRUPAL_CORE_COMPATIBILITY . '-', '', $modules[$dependency]->info['version']))) {
-          $row['#requires'][$dependency] = $this->translationManager->translate('@module (<span class="admin-missing">incompatible with</span> version @version)', array(
+          $row['#requires'][$dependency] = $this->t('@module (<span class="admin-missing">incompatible with</span> version @version)', array(
             '@module' => $name . $incompatible_version,
             '@version' => $modules[$dependency]->info['version'],
           ));
@@ -294,16 +288,16 @@ protected function buildRow(array $modules, $module, $distribution) {
         // Disable the checkbox if the dependency is incompatible with this
         // version of Drupal core.
         elseif ($modules[$dependency]->info['core'] != DRUPAL_CORE_COMPATIBILITY) {
-          $row['#requires'][$dependency] = $this->translationManager->translate('@module (<span class="admin-missing">incompatible with</span> this version of Drupal core)', array(
+          $row['#requires'][$dependency] = $this->t('@module (<span class="admin-missing">incompatible with</span> this version of Drupal core)', array(
             '@module' => $name,
           ));
           $row['enable']['#disabled'] = TRUE;
         }
         elseif ($modules[$dependency]->status) {
-          $row['#requires'][$dependency] = $this->translationManager->translate('@module', array('@module' => $name));
+          $row['#requires'][$dependency] = $this->t('@module', array('@module' => $name));
         }
         else {
-          $row['#requires'][$dependency] = $this->translationManager->translate('@module (<span class="admin-disabled">disabled</span>)', array('@module' => $name));
+          $row['#requires'][$dependency] = $this->t('@module (<span class="admin-disabled">disabled</span>)', array('@module' => $name));
         }
       }
     }
@@ -313,11 +307,11 @@ protected function buildRow(array $modules, $module, $distribution) {
     foreach ($module->required_by as $dependent => $version) {
       if (isset($modules[$dependent]) && empty($modules[$dependent]->info['hidden'])) {
         if ($modules[$dependent]->status == 1 && $module->status == 1) {
-          $row['#required_by'][$dependent] = $this->translationManager->translate('@module', array('@module' => $modules[$dependent]->info['name']));
+          $row['#required_by'][$dependent] = $this->t('@module', array('@module' => $modules[$dependent]->info['name']));
           $row['enable']['#disabled'] = TRUE;
         }
         else {
-          $row['#required_by'][$dependent] = $this->translationManager->translate('@module (<span class="admin-disabled">disabled</span>)', array('@module' => $modules[$dependent]->info['name']));
+          $row['#required_by'][$dependent] = $this->t('@module (<span class="admin-disabled">disabled</span>)', array('@module' => $modules[$dependent]->info['name']));
         }
       }
     }
@@ -412,12 +406,6 @@ protected function buildModuleList(array $form_state) {
   /**
    * {@inheritdoc}
    */
-  public function validateForm(array &$form, array &$form_state) {
-  }
-
-  /**
-   * {@inheritdoc}
-   */
   public function submitForm(array &$form, array &$form_state) {
     // Retrieve a list of modules to enable/disable and their dependencies.
     $modules = $this->buildModuleList($form_state);
diff --git a/core/modules/system/lib/Drupal/system/Form/ModulesUninstallForm.php b/core/modules/system/lib/Drupal/system/Form/ModulesUninstallForm.php
index a6b3dea..a8649db 100644
--- a/core/modules/system/lib/Drupal/system/Form/ModulesUninstallForm.php
+++ b/core/modules/system/lib/Drupal/system/Form/ModulesUninstallForm.php
@@ -7,19 +7,18 @@
 
 namespace Drupal\system\Form;
 
-use Drupal\Core\Form\FormInterface;
-use Drupal\Core\StringTranslation\TranslationManager;
-use Symfony\Component\DependencyInjection\ContainerInterface;
 use Drupal\Core\Controller\ControllerInterface;
-use Drupal\Core\KeyValueStore\KeyValueExpirableFactory;
-use Drupal\Core\KeyValueStore\KeyValueStoreExpirableInterface;
 use Drupal\Core\Extension\ModuleHandlerInterface;
+use Drupal\Core\Form\FormBase;
+use Drupal\Core\KeyValueStore\KeyValueStoreExpirableInterface;
+use Drupal\Core\StringTranslation\TranslationManager;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\HttpFoundation\Request;
 
 /**
  * Provides a form for uninstalling modules.
  */
-class ModulesUninstallForm implements FormInterface, ControllerInterface {
+class ModulesUninstallForm extends FormBase implements ControllerInterface {
 
   /**
    * The module handler service.
@@ -36,13 +35,6 @@ class ModulesUninstallForm implements FormInterface, ControllerInterface {
   protected $keyValueExpirable;
 
   /**
-   * The translation manager service.
-   *
-   * @var \Drupal\Core\StringTranslation\TranslationManager
-   */
-  protected $translationManager;
-
-  /**
    * The request object.
    *
    * @var \Symfony\Component\HttpFoundation\Request
@@ -71,9 +63,10 @@ public static function create(ContainerInterface $container) {
    *   The translation manager.
    */
   public function __construct(ModuleHandlerInterface $module_handler, KeyValueStoreExpirableInterface $key_value_expirable, TranslationManager $translation_manager) {
+    parent::__construct($translation_manager);
+
     $this->moduleHandler = $module_handler;
     $this->keyValueExpirable = $key_value_expirable;
-    $this->translationManager = $translation_manager;
   }
 
   /**
@@ -118,11 +111,11 @@ public function buildForm(array $form, array &$form_state, Request $request = NU
       $name = $module->info['name'] ?: $module->name;
       $form['modules'][$module->name]['#module_name'] = $name;
       $form['modules'][$module->name]['name']['#markup'] = $name;
-      $form['modules'][$module->name]['description']['#markup'] = $this->translationManager->translate($module->info['description']);
+      $form['modules'][$module->name]['description']['#markup'] = $this->t($module->info['description']);
 
       $form['uninstall'][$module->name] = array(
         '#type' => 'checkbox',
-        '#title' => $this->translationManager->translate('Uninstall @module module', array('@module' => $name)),
+        '#title' => $this->t('Uninstall @module module', array('@module' => $name)),
         '#title_display' => 'invisible',
       );
 
@@ -141,7 +134,7 @@ public function buildForm(array $form, array &$form_state, Request $request = NU
     $form['actions'] = array('#type' => 'actions');
     $form['actions']['submit'] = array(
       '#type' => 'submit',
-      '#value' => $this->translationManager->translate('Uninstall'),
+      '#value' => $this->t('Uninstall'),
     );
 
     return $form;
@@ -153,7 +146,7 @@ public function buildForm(array $form, array &$form_state, Request $request = NU
   public function validateForm(array &$form, array &$form_state) {
     // Form submitted, but no modules selected.
     if (!array_filter($form_state['values']['uninstall'])) {
-      drupal_set_message($this->translationManager->translate('No modules selected.'), 'error');
+      drupal_set_message($this->t('No modules selected.'), 'error');
       $form_state['redirect'] = 'admin/modules/uninstall';
     }
   }