diff --git a/core/modules/block/lib/Drupal/block/Plugin/Core/Entity/Block.php b/core/modules/block/lib/Drupal/block/Plugin/Core/Entity/Block.php
index 84e43e7..75d82e8 100644
--- a/core/modules/block/lib/Drupal/block/Plugin/Core/Entity/Block.php
+++ b/core/modules/block/lib/Drupal/block/Plugin/Core/Entity/Block.php
@@ -177,6 +177,7 @@ public function getExportProperties() {
       'visibility',
       'plugin',
       'settings',
+      'langcode',
     );
     $properties = array();
     foreach ($names as $name) {
diff --git a/core/modules/block/lib/Drupal/block/Tests/BlockStorageUnitTest.php b/core/modules/block/lib/Drupal/block/Tests/BlockStorageUnitTest.php
index d98f245..ec4e7cd 100644
--- a/core/modules/block/lib/Drupal/block/Tests/BlockStorageUnitTest.php
+++ b/core/modules/block/lib/Drupal/block/Tests/BlockStorageUnitTest.php
@@ -103,6 +103,7 @@ protected function createTests() {
         'cache' => '1',
         'admin_label' => t('Test block html id'),
       ),
+      'langcode' => LANGUAGE_NOT_SPECIFIED,
     );
     $this->assertIdentical($actual_properties, $expected_properties, 'The block properties are exported correctly.');
 
diff --git a/core/modules/image/config/image.style.large.yml b/core/modules/image/config/image.style.large.yml
index 012af17..ada3d29 100644
--- a/core/modules/image/config/image.style.large.yml
+++ b/core/modules/image/config/image.style.large.yml
@@ -9,3 +9,4 @@ effects:
       upscale: '1'
     weight: '0'
     ieid: ddd73aa7-4bd6-4c85-b600-bdf2b1628d1d
+langcode: en
diff --git a/core/modules/image/config/image.style.medium.yml b/core/modules/image/config/image.style.medium.yml
index 941ab85..ce9e1bd 100644
--- a/core/modules/image/config/image.style.medium.yml
+++ b/core/modules/image/config/image.style.medium.yml
@@ -9,3 +9,4 @@ effects:
       upscale: '1'
     weight: '0'
     ieid: bddf0d06-42f9-4c75-a700-a33cafa25ea0
+langcode: en
diff --git a/core/modules/image/config/image.style.thumbnail.yml b/core/modules/image/config/image.style.thumbnail.yml
index a454200..f89bf0d 100644
--- a/core/modules/image/config/image.style.thumbnail.yml
+++ b/core/modules/image/config/image.style.thumbnail.yml
@@ -9,3 +9,4 @@ effects:
       upscale: '1'
     weight: '0'
     ieid: 1cfec298-8620-4749-b100-ccb6c4500779
+langcode: en
diff --git a/core/modules/menu/config/menu.menu.account.yml b/core/modules/menu/config/menu.menu.account.yml
index 6be2706..3143c4e 100644
--- a/core/modules/menu/config/menu.menu.account.yml
+++ b/core/modules/menu/config/menu.menu.account.yml
@@ -1,3 +1,4 @@
 id: account
 label: User account menu
 description: Links related to the user account.
+langcode: en
diff --git a/core/modules/menu/config/menu.menu.admin.yml b/core/modules/menu/config/menu.menu.admin.yml
index 5435da5..ba94fc3 100644
--- a/core/modules/menu/config/menu.menu.admin.yml
+++ b/core/modules/menu/config/menu.menu.admin.yml
@@ -1,3 +1,4 @@
 id: admin
 label: Administration
 description: Contains links to administrative tasks.
+langcode: en
diff --git a/core/modules/menu/config/menu.menu.footer.yml b/core/modules/menu/config/menu.menu.footer.yml
index 9dda784..d671599 100644
--- a/core/modules/menu/config/menu.menu.footer.yml
+++ b/core/modules/menu/config/menu.menu.footer.yml
@@ -1,3 +1,4 @@
 id: footer
 label: Footer
 description: Use this for linking to site information.
+langcode: en
diff --git a/core/modules/menu/config/menu.menu.main.yml b/core/modules/menu/config/menu.menu.main.yml
index 3dfe975..29be82d 100644
--- a/core/modules/menu/config/menu.menu.main.yml
+++ b/core/modules/menu/config/menu.menu.main.yml
@@ -1,3 +1,4 @@
 id: main
 label: Main navigation
 description: Use this for linking to the main site sections.
+langcode: en
diff --git a/core/modules/menu/config/menu.menu.tools.yml b/core/modules/menu/config/menu.menu.tools.yml
index 3f15287..3971eea 100644
--- a/core/modules/menu/config/menu.menu.tools.yml
+++ b/core/modules/menu/config/menu.menu.tools.yml
@@ -1,3 +1,4 @@
 id: tools
 label: Tools
 description: Contains links for site visitors. Some modules add their links here.
+langcode: en
diff --git a/core/modules/tour/lib/Drupal/tour/Plugin/Core/Entity/Tour.php b/core/modules/tour/lib/Drupal/tour/Plugin/Core/Entity/Tour.php
index 8d2bff0..9d5b7cb 100644
--- a/core/modules/tour/lib/Drupal/tour/Plugin/Core/Entity/Tour.php
+++ b/core/modules/tour/lib/Drupal/tour/Plugin/Core/Entity/Tour.php
@@ -127,6 +127,7 @@ public function getExportProperties() {
       'label',
       'paths',
       'tips',
+      'langcode',
     );
     foreach ($names as $name) {
       $properties[$name] = $this->get($name);
diff --git a/core/profiles/standard/config/block.block.bartik.content.yml b/core/profiles/standard/config/block.block.bartik.content.yml
index 7f1a9f8..fd53c61 100644
--- a/core/profiles/standard/config/block.block.bartik.content.yml
+++ b/core/profiles/standard/config/block.block.bartik.content.yml
@@ -18,4 +18,4 @@ label: ''
 module: system
 region: content
 weight: '0'
-langcode: und
+langcode: en
diff --git a/core/profiles/standard/config/block.block.bartik.footer.yml b/core/profiles/standard/config/block.block.bartik.footer.yml
index 4496313..194a598 100644
--- a/core/profiles/standard/config/block.block.bartik.footer.yml
+++ b/core/profiles/standard/config/block.block.bartik.footer.yml
@@ -18,4 +18,4 @@ visibility:
 module: system
 region: footer
 weight: '0'
-langcode: und
+langcode: en
diff --git a/core/profiles/standard/config/block.block.bartik.help.yml b/core/profiles/standard/config/block.block.bartik.help.yml
index 58d10a3..89814c9 100644
--- a/core/profiles/standard/config/block.block.bartik.help.yml
+++ b/core/profiles/standard/config/block.block.bartik.help.yml
@@ -18,4 +18,4 @@ label: ''
 module: system
 region: help
 weight: '0'
-langcode: und
+langcode: en
diff --git a/core/profiles/standard/config/block.block.bartik.login.yml b/core/profiles/standard/config/block.block.bartik.login.yml
index 21d73d8..8bb0bbd 100644
--- a/core/profiles/standard/config/block.block.bartik.login.yml
+++ b/core/profiles/standard/config/block.block.bartik.login.yml
@@ -19,4 +19,4 @@ module: user
 region: sidebar_first
 weight: '0'
 plugin: user_login_block
-langcode: und
+langcode: en
diff --git a/core/profiles/standard/config/block.block.bartik.powered.yml b/core/profiles/standard/config/block.block.bartik.powered.yml
index 446e51a..9c54359 100644
--- a/core/profiles/standard/config/block.block.bartik.powered.yml
+++ b/core/profiles/standard/config/block.block.bartik.powered.yml
@@ -18,4 +18,4 @@ label: ''
 module: system
 region: footer
 weight: '10'
-langcode: und
+langcode: en
diff --git a/core/profiles/standard/config/block.block.bartik.search.yml b/core/profiles/standard/config/block.block.bartik.search.yml
index 3dcda34..bd43d51 100644
--- a/core/profiles/standard/config/block.block.bartik.search.yml
+++ b/core/profiles/standard/config/block.block.bartik.search.yml
@@ -18,4 +18,4 @@ label: 'Search'
 module: search
 region: sidebar_first
 weight: '-1'
-langcode: und
+langcode: en
diff --git a/core/profiles/standard/config/block.block.bartik.tools.yml b/core/profiles/standard/config/block.block.bartik.tools.yml
index 44e3aeb..ff2c634 100644
--- a/core/profiles/standard/config/block.block.bartik.tools.yml
+++ b/core/profiles/standard/config/block.block.bartik.tools.yml
@@ -18,4 +18,4 @@ label: 'Tools'
 module: system
 region: sidebar_first
 weight: '0'
-langcode: und
+langcode: en
diff --git a/core/profiles/standard/config/block.block.seven.content.yml b/core/profiles/standard/config/block.block.seven.content.yml
index 675f718..11f76a9 100644
--- a/core/profiles/standard/config/block.block.seven.content.yml
+++ b/core/profiles/standard/config/block.block.seven.content.yml
@@ -18,4 +18,4 @@ label: ''
 module: system
 region: content
 weight: '0'
-langcode: und
+langcode: en
diff --git a/core/profiles/standard/config/block.block.seven.help.yml b/core/profiles/standard/config/block.block.seven.help.yml
index 72c4509..9a29775 100644
--- a/core/profiles/standard/config/block.block.seven.help.yml
+++ b/core/profiles/standard/config/block.block.seven.help.yml
@@ -18,4 +18,4 @@ label: ''
 module: system
 region: help
 weight: '0'
-langcode: und
+langcode: en
diff --git a/core/profiles/standard/config/block.block.seven.login.yml b/core/profiles/standard/config/block.block.seven.login.yml
index c35ba59..8e89cd0 100644
--- a/core/profiles/standard/config/block.block.seven.login.yml
+++ b/core/profiles/standard/config/block.block.seven.login.yml
@@ -18,4 +18,4 @@ label: 'User login'
 module: user
 region: content
 weight: '10'
-langcode: und
+langcode: en
diff --git a/core/profiles/standard/config/filter.format.filtered_html.yml b/core/profiles/standard/config/filter.format.filtered_html.yml
index 11623fe..e37e676 100644
--- a/core/profiles/standard/config/filter.format.filtered_html.yml
+++ b/core/profiles/standard/config/filter.format.filtered_html.yml
@@ -19,4 +19,4 @@ filters:
   filter_htmlcorrector:
     module: filter
     status: '1'
-langcode: und
+langcode: en
diff --git a/core/profiles/standard/config/filter.format.full_html.yml b/core/profiles/standard/config/filter.format.full_html.yml
index 26ff727..5c2a7a0 100644
--- a/core/profiles/standard/config/filter.format.full_html.yml
+++ b/core/profiles/standard/config/filter.format.full_html.yml
@@ -15,4 +15,4 @@ filters:
   filter_htmlcorrector:
     module: filter
     status: '1'
-langcode: und
+langcode: en
diff --git a/core/profiles/standard/config/user.role.administrator.yml b/core/profiles/standard/config/user.role.administrator.yml
index 71187f9..282e88c 100644
--- a/core/profiles/standard/config/user.role.administrator.yml
+++ b/core/profiles/standard/config/user.role.administrator.yml
@@ -1,3 +1,4 @@
 id: administrator
 label: Administrator
 weight: 2
+langcode: en