diff -u b/core/modules/ckeditor/src/Tests/CKEditorAdminTest.php b/core/modules/ckeditor/src/Tests/CKEditorAdminTest.php
--- b/core/modules/ckeditor/src/Tests/CKEditorAdminTest.php
+++ b/core/modules/ckeditor/src/Tests/CKEditorAdminTest.php
@@ -101,7 +101,11 @@
           ),
         ),
       ),
-      'plugins' => array(),
+      'plugins' => array(
+        'language' => array(
+          'list_type' => 'un',
+        ),
+      ),
     );
     $this->assertIdentical($ckeditor->getDefaultSettings(), $expected_default_settings);
 
@@ -125,7 +129,6 @@
 
     // Ensure an Editor object exists now, with the proper settings.
     $expected_settings = $expected_default_settings;
-    $expected_settings['plugins']['language']['list_type'] = 'un';
     $expected_settings['plugins']['stylescombo']['styles'] = '';
     $editor = entity_load('editor', 'filtered_html');
     $this->assertTrue($editor instanceof Editor, 'An Editor config entity exists now.');
@@ -242,7 +245,6 @@
 
     // Ensure an Editor object exists now, with the proper settings.
     $expected_settings = $default_settings;
-    $expected_settings['plugins']['language']['list_type'] = 'un';
     $expected_settings['plugins']['stylescombo']['styles'] = '';
     $editor = entity_load('editor', 'amazing_format');
     $this->assertTrue($editor instanceof Editor, 'An Editor config entity exists now.');
diff -u b/core/modules/ckeditor/src/Tests/CKEditorTest.php b/core/modules/ckeditor/src/Tests/CKEditorTest.php
--- b/core/modules/ckeditor/src/Tests/CKEditorTest.php
+++ b/core/modules/ckeditor/src/Tests/CKEditorTest.php
@@ -432,7 +432,6 @@
     return array(
       file_create_url('core/modules/ckeditor/css/ckeditor-iframe.css'),
       file_create_url('core/modules/system/css/system.module.css'),
-      file_create_url('core/modules/ckeditor/css/plugins/language/ckeditor.language.css'),
     );
   }
 
@@ -441,6 +440,7 @@
     return array(
       file_create_url('core/modules/ckeditor/css/ckeditor-iframe.css'),
       file_create_url('core/modules/system/css/system.module.css'),
+      file_create_url('core/modules/ckeditor/css/plugins/language/ckeditor.language.css'),
     );
   }
 
only in patch2:
unchanged:
--- a/core/modules/ckeditor/src/Plugin/Editor/CKEditor.php
+++ b/core/modules/ckeditor/src/Plugin/Editor/CKEditor.php
@@ -121,7 +121,11 @@ public function getDefaultSettings() {
           ),
         ),
       ),
-      'plugins' => array(),
+      'plugins' => array(
+        'language' => array(
+          'list_type' => 'un',
+        ),
+      ),
     );
   }