diff --git a/core/modules/comment/src/Tests/CommentTestBase.php b/core/modules/comment/src/Tests/CommentTestBase.php
index bb4e55e..05f139d 100644
--- a/core/modules/comment/src/Tests/CommentTestBase.php
+++ b/core/modules/comment/src/Tests/CommentTestBase.php
@@ -82,7 +82,7 @@ protected function setUp() {
     $this->container->get('comment.manager')->addDefaultField('node', 'article');
 
     // Create a test node authored by the web user.
-    $this->node = $this->drupalCreateNode(array('type' => 'article', 'promote' => 1, 'uid' => $this->web_user->id(), 'langcode' => 'en'));
+    $this->node = $this->drupalCreateNode(array('type' => 'article', 'promote' => 1, 'uid' => $this->web_user->id()));
   }
 
   /**
diff --git a/core/modules/contextual/src/Tests/ContextualDynamicContextTest.php b/core/modules/contextual/src/Tests/ContextualDynamicContextTest.php
index c4150f3..61fa85e 100644
--- a/core/modules/contextual/src/Tests/ContextualDynamicContextTest.php
+++ b/core/modules/contextual/src/Tests/ContextualDynamicContextTest.php
@@ -50,9 +50,9 @@ function testDifferentPermissions() {
     // - An article, which should be user-editable.
     // - A page, which should not be user-editable.
     // - A second article, which should also be user-editable.
-    $node1 = $this->drupalCreateNode(array('type' => 'article', 'promote' => 1, 'langcode' => 'en'));
-    $node2 = $this->drupalCreateNode(array('type' => 'page', 'promote' => 1, 'langcode' => 'en'));
-    $node3 = $this->drupalCreateNode(array('type' => 'article', 'promote' => 1, 'langcode' => 'en'));
+    $node1 = $this->drupalCreateNode(array('type' => 'article', 'promote' => 1));
+    $node2 = $this->drupalCreateNode(array('type' => 'page', 'promote' => 1));
+    $node3 = $this->drupalCreateNode(array('type' => 'article', 'promote' => 1));
 
     // Now, on the front page, all article nodes should have contextual links
     // placeholders, as should the view that contains them.
diff --git a/core/modules/file/src/Tests/FileFieldRSSContentTest.php b/core/modules/file/src/Tests/FileFieldRSSContentTest.php
index 42b88ce..db265c2 100644
--- a/core/modules/file/src/Tests/FileFieldRSSContentTest.php
+++ b/core/modules/file/src/Tests/FileFieldRSSContentTest.php
@@ -51,7 +51,7 @@ function testFileFieldRSSContent() {
 
     // Create a new node with a file field set. Promote to frontpage
     // needs to be set so this node will appear in the RSS feed.
-    $node = $this->drupalCreateNode(array('type' => $type_name, 'promote' => 1, 'langcode' => 'en'));
+    $node = $this->drupalCreateNode(array('type' => $type_name, 'promote' => 1));
     $test_file = $this->getTestFile('text');
 
     // Create a new node with the uploaded file.
diff --git a/core/modules/node/src/NodeViewsData.php b/core/modules/node/src/NodeViewsData.php
index 008d175..e767c2e 100644
--- a/core/modules/node/src/NodeViewsData.php
+++ b/core/modules/node/src/NodeViewsData.php
@@ -73,13 +73,15 @@ public function getViewsData() {
     $data['node_field_data']['sticky']['filter']['type'] = 'yes-no';
     $data['node_field_data']['sticky']['sort']['help'] = t('Whether or not the content is sticky. To list sticky content first, set this to descending.');
 
-    $data['node']['translation_link'] = array(
-      'title' => t('Translation link'),
-      'help' => t('Provide a link to the translations overview for nodes.'),
-      'field' => array(
-        'id' => 'content_translation_link',
-      ),
-    );
+    if (\Drupal::moduleHandler()->moduleExists('content_translation')) {
+      $data['node']['translation_link'] = array(
+        'title' => t('Translation link'),
+        'help' => t('Provide a link to the translations overview for nodes.'),
+        'field' => array(
+          'id' => 'content_translation_link',
+        ),
+      );
+    }
 
     $data['node']['view_node'] = array(
       'field' => array(
diff --git a/core/modules/node/src/Tests/NodeLinksTest.php b/core/modules/node/src/Tests/NodeLinksTest.php
index 718f8c8..4c0efa7 100644
--- a/core/modules/node/src/Tests/NodeLinksTest.php
+++ b/core/modules/node/src/Tests/NodeLinksTest.php
@@ -27,7 +27,6 @@ public function testHideLinks() {
     $node = $this->drupalCreateNode(array(
       'type' => 'article',
       'promote' => NODE_PROMOTED,
-      'langcode' => 'en',
     ));
 
     // Links are displayed by default.
diff --git a/core/modules/node/src/Tests/NodeLoadMultipleTest.php b/core/modules/node/src/Tests/NodeLoadMultipleTest.php
index fbeb16b..3cea6a1 100644
--- a/core/modules/node/src/Tests/NodeLoadMultipleTest.php
+++ b/core/modules/node/src/Tests/NodeLoadMultipleTest.php
@@ -31,10 +31,10 @@ protected function setUp() {
    * Creates four nodes and ensures that they are loaded correctly.
    */
   function testNodeMultipleLoad() {
-    $node1 = $this->drupalCreateNode(array('type' => 'article', 'promote' => 1, 'langcode' => 'en'));
-    $node2 = $this->drupalCreateNode(array('type' => 'article', 'promote' => 1, 'langcode' => 'en'));
-    $node3 = $this->drupalCreateNode(array('type' => 'article', 'promote' => 0, 'langcode' => 'en'));
-    $node4 = $this->drupalCreateNode(array('type' => 'page', 'promote' => 0, 'langcode' => 'en'));
+    $node1 = $this->drupalCreateNode(array('type' => 'article', 'promote' => 1));
+    $node2 = $this->drupalCreateNode(array('type' => 'article', 'promote' => 1));
+    $node3 = $this->drupalCreateNode(array('type' => 'article', 'promote' => 0));
+    $node4 = $this->drupalCreateNode(array('type' => 'page', 'promote' => 0));
 
     // Confirm that promoted nodes appear in the default node listing.
     $this->drupalGet('node');
diff --git a/core/modules/node/src/Tests/NodeRSSContentTest.php b/core/modules/node/src/Tests/NodeRSSContentTest.php
index 6a1c830..e4b7cb3 100644
--- a/core/modules/node/src/Tests/NodeRSSContentTest.php
+++ b/core/modules/node/src/Tests/NodeRSSContentTest.php
@@ -40,7 +40,7 @@ protected function setUp() {
    */
   function testNodeRSSContent() {
     // Create a node.
-    $node = $this->drupalCreateNode(array('type' => 'article', 'promote' => 1, 'langcode' => 'en'));
+    $node = $this->drupalCreateNode(array('type' => 'article', 'promote' => 1));
 
     $this->drupalGet('rss.xml');
 
diff --git a/core/modules/node/src/Tests/NodeTitleTest.php b/core/modules/node/src/Tests/NodeTitleTest.php
index 470465c..d692be5 100644
--- a/core/modules/node/src/Tests/NodeTitleTest.php
+++ b/core/modules/node/src/Tests/NodeTitleTest.php
@@ -41,7 +41,6 @@ function testNodeTitle() {
     $settings = array(
       'title' => $this->randomMachineName(8),
       'promote' => 1,
-      'langcode' => 'en',
     );
     $node = $this->drupalCreateNode($settings);
 
@@ -65,7 +64,6 @@ function testNodeTitle() {
     // Test edge case where node title is set to 0.
     $settings = array(
       'title' => 0,
-      'langcode' => 'en',
     );
     $node = $this->drupalCreateNode($settings);
     // Test that 0 appears as <title>.
diff --git a/core/modules/rdf/src/Tests/StandardProfileTest.php b/core/modules/rdf/src/Tests/StandardProfileTest.php
index e21c7cf..d097a5e 100644
--- a/core/modules/rdf/src/Tests/StandardProfileTest.php
+++ b/core/modules/rdf/src/Tests/StandardProfileTest.php
@@ -139,7 +139,6 @@ protected function setUp() {
     $article_settings = array(
       'type' => 'article',
       'promote' => NODE_PROMOTED,
-      'langcode' => 'en',
       'field_image' => array(
         array(
           'target_id' => $this->image->id(),
@@ -153,13 +152,13 @@ protected function setUp() {
     );
     $this->article = $this->drupalCreateNode($article_settings);
     // Create second article to test teaser list.
-    $this->drupalCreateNode(array('type' => 'article', 'promote' => NODE_PROMOTED, 'langcode' => 'en'));
+    $this->drupalCreateNode(array('type' => 'article', 'promote' => NODE_PROMOTED,));
 
     // Create article comment.
     $this->articleComment = $this->saveComment($this->article->id(), $this->webUser->id(), NULL, 0);
 
     // Create page.
-    $this->page = $this->drupalCreateNode(array('type' => 'page', 'langcode' => 'en'));
+    $this->page = $this->drupalCreateNode(array('type' => 'page'));
 
     // Set URIs.
     // Image.
diff --git a/core/modules/system/src/Tests/System/FrontPageTest.php b/core/modules/system/src/Tests/System/FrontPageTest.php
index 609da92..dd24ef5 100644
--- a/core/modules/system/src/Tests/System/FrontPageTest.php
+++ b/core/modules/system/src/Tests/System/FrontPageTest.php
@@ -30,7 +30,7 @@ protected function setUp() {
     $this->admin_user = $this->drupalCreateUser(array('access content', 'administer site configuration'));
     $this->drupalLogin($this->admin_user);
     $this->drupalCreateContentType(array('type' => 'page'));
-    $this->node_path = "node/" . $this->drupalCreateNode(array('promote' => 1, 'langcode' => 'en'))->id();
+    $this->node_path = "node/" . $this->drupalCreateNode(array('promote' => 1))->id();
 
     // Configure 'node' as front page.
     \Drupal::config('system.site')->set('page.front', 'node')->save();
diff --git a/core/modules/views/src/Tests/DefaultViewsTest.php b/core/modules/views/src/Tests/DefaultViewsTest.php
index e656058..c0feff5 100644
--- a/core/modules/views/src/Tests/DefaultViewsTest.php
+++ b/core/modules/views/src/Tests/DefaultViewsTest.php
@@ -94,7 +94,6 @@ protected function setUp() {
       if ($i % 2) {
         $values['promote'] = TRUE;
       }
-      $values['langcode'] = 'en';
       $values['body'][]['value'] = l('Node ' . 1, 'node/' . 1);
 
       $node = $this->drupalCreateNode($values);
diff --git a/core/profiles/standard/src/Tests/StandardTest.php b/core/profiles/standard/src/Tests/StandardTest.php
index 32eebe3..9977e64 100644
--- a/core/profiles/standard/src/Tests/StandardTest.php
+++ b/core/profiles/standard/src/Tests/StandardTest.php
@@ -75,7 +75,6 @@ function testStandard() {
       'title' => 'Foobar',
       'promote' => 1,
       'status' => 1,
-      'langcode' => 'en'
     ));
 
     // Add a comment.