diff --git a/core/lib/Drupal/Component/Utility/UserAgent.php b/core/lib/Drupal/Component/Utility/UserAgent.php
index d91074b18bedf30e9d5d51f871b049757520d6b7..8b35c7599beb467a70cf1b6eb21576cc39b25121 100644
--- a/core/lib/Drupal/Component/Utility/UserAgent.php
+++ b/core/lib/Drupal/Component/Utility/UserAgent.php
@@ -106,7 +106,7 @@ public static function getBestMatchingLangcode($http_accept_language, $langcodes
       }
     }
 
-    // Find the enabled language with the greatest qvalue, following the rules
+    // Find the added language with the greatest qvalue, following the rules
     // of RFC 2616 (section 14.4). If several languages have the same qvalue,
     // prefer the one with the greatest weight.
     $best_match_langcode = FALSE;
diff --git a/core/lib/Drupal/Core/Language/LanguageManagerInterface.php b/core/lib/Drupal/Core/Language/LanguageManagerInterface.php
index da1a079ac54ffc472fe4c144e0a071530410a7e8..43b2f23fd51bd69a81a12106211daf0e2d3d02a2 100644
--- a/core/lib/Drupal/Core/Language/LanguageManagerInterface.php
+++ b/core/lib/Drupal/Core/Language/LanguageManagerInterface.php
@@ -28,10 +28,10 @@ public function setTranslation(TranslationInterface $translation);
   public function init();
 
   /**
-   * Returns whether or not the site has more than one language enabled.
+   * Returns whether or not the site has more than one language added.
    *
    * @return bool
-   *   TRUE if more than one language is enabled, FALSE otherwise.
+   *   TRUE if more than one language is added, FALSE otherwise.
    */
   public function isMultilingual();
 
diff --git a/core/modules/content_translation/content_translation.install b/core/modules/content_translation/content_translation.install
index b814f2dc428b6844382a3334e073bee792114776..f6dda75656ba1e476f3e71a3ea13fd6f185ab99b 100644
--- a/core/modules/content_translation/content_translation.install
+++ b/core/modules/content_translation/content_translation.install
@@ -107,10 +107,10 @@ function content_translation_install() {
  * Implements hook_enable().
  */
 function content_translation_enable() {
-  // Translation works when at least two languages are enabled.
+  // Translation works when at least two languages are added.
   if (count(\Drupal::languageManager()->getLanguages()) < 2) {
     $t_args = array('!language_url' => url('admin/config/regional/language'));
-    $message = t('Be sure to <a href="!language_url">enable at least two languages</a> to translate content.', $t_args);
+    $message = t('Be sure to <a href="!language_url">add at least two languages</a> to translate content.', $t_args);
     drupal_set_message($message, 'warning');
   }
   // Point the user to the content translation settings.
diff --git a/core/modules/content_translation/lib/Drupal/content_translation/Tests/ContentTranslationTestBase.php b/core/modules/content_translation/lib/Drupal/content_translation/Tests/ContentTranslationTestBase.php
index 415b116e5d98bb4f928782d8ac841c2576aad517..cec940431db2081ba83a67be493a5cf78275adac 100644
--- a/core/modules/content_translation/lib/Drupal/content_translation/Tests/ContentTranslationTestBase.php
+++ b/core/modules/content_translation/lib/Drupal/content_translation/Tests/ContentTranslationTestBase.php
@@ -38,7 +38,7 @@ abstract class ContentTranslationTestBase extends WebTestBase {
   protected $bundle;
 
   /**
-   * The enabled languages.
+   * The added languages.
    *
    * @var array
    */
@@ -96,7 +96,7 @@ function setUp() {
   }
 
   /**
-   * Enables additional languages.
+   * Adds additional languages.
    */
   protected function setupLanguages() {
     $this->langcodes = array('it', 'fr');
diff --git a/core/modules/content_translation/lib/Drupal/content_translation/Tests/ContentTranslationUITest.php b/core/modules/content_translation/lib/Drupal/content_translation/Tests/ContentTranslationUITest.php
index 96bf8b29ba3dde8bd6a2e76f006a7e7aa59fce4b..4454176e028e5ee0883829132cb33d4609396c34 100644
--- a/core/modules/content_translation/lib/Drupal/content_translation/Tests/ContentTranslationUITest.php
+++ b/core/modules/content_translation/lib/Drupal/content_translation/Tests/ContentTranslationUITest.php
@@ -130,21 +130,21 @@ protected function doTestOutdatedStatus() {
     $entity = entity_load($this->entityTypeId, $this->entityId, TRUE);
 
     // Check that every translation has the correct "outdated" status.
-    foreach ($this->langcodes as $enabled_langcode) {
-      $prefix = $enabled_langcode != $default_langcode ? $enabled_langcode . '/' : '';
+    foreach ($this->langcodes as $added_langcode) {
+      $prefix = $added_langcode != $default_langcode ? $added_langcode . '/' : '';
       $path = $prefix . $edit_path;
       $this->drupalGet($path);
-      if ($enabled_langcode == $langcode) {
+      if ($added_langcode == $langcode) {
         $this->assertFieldByXPath('//input[@name="content_translation[retranslate]"]', FALSE, 'The retranslate flag is not checked by default.');
       }
       else {
         $this->assertFieldByXPath('//input[@name="content_translation[outdated]"]', TRUE, 'The translate flag is checked by default.');
         $edit = array('content_translation[outdated]' => FALSE);
-        $this->drupalPostForm($path, $edit, $this->getFormSubmitAction($entity, $enabled_langcode));
+        $this->drupalPostForm($path, $edit, $this->getFormSubmitAction($entity, $added_langcode));
         $this->drupalGet($path);
         $this->assertFieldByXPath('//input[@name="content_translation[retranslate]"]', FALSE, 'The retranslate flag is now shown.');
         $entity = entity_load($this->entityTypeId, $this->entityId, TRUE);
-        $this->assertFalse($entity->translation[$enabled_langcode]['outdated'], 'The "outdated" status has been correctly stored.');
+        $this->assertFalse($entity->translation[$added_langcode]['outdated'], 'The "outdated" status has been correctly stored.');
       }
     }
   }
diff --git a/core/modules/language/language.module b/core/modules/language/language.module
index 845407d4d1b1d1f732eec57e5cc916d75b55b422..08cd8e05eb285ce8a58ecbbc375f676fbef2b626 100644
--- a/core/modules/language/language.module
+++ b/core/modules/language/language.module
@@ -60,7 +60,7 @@ function language_help($path, $arg) {
     case 'admin/structure/block/manage/%':
     case 'admin/structure/block/add/%/%':
       if ($arg[4] == 'language' && $arg[5] == 'language_interface') {
-        return '<p>' . t('With multiple languages enabled, registered users can select their preferred language and authors can assign a specific language to content.') . '</p>';
+        return '<p>' . t('With multiple languages added, registered users can select their preferred language and authors can assign a specific language to content.') . '</p>';
       }
       break;
 
diff --git a/core/modules/language/lib/Drupal/language/Plugin/LanguageNegotiation/LanguageNegotiationUrl.php b/core/modules/language/lib/Drupal/language/Plugin/LanguageNegotiation/LanguageNegotiationUrl.php
index eacb5c409c3ce6913d28dee76e6586fc0a9b2853..42a093304f0e415fb5a0b01d18ab8f8bbb2dc8d9 100644
--- a/core/modules/language/lib/Drupal/language/Plugin/LanguageNegotiation/LanguageNegotiationUrl.php
+++ b/core/modules/language/lib/Drupal/language/Plugin/LanguageNegotiation/LanguageNegotiationUrl.php
@@ -59,7 +59,7 @@ public function getLangcode(Request $request = NULL) {
           $path_args = explode('/', $request_path);
           $prefix = array_shift($path_args);
 
-          // Search prefix within enabled languages.
+          // Search prefix within added languages.
           $negotiated_language = FALSE;
           foreach ($languages as $language) {
             if (isset($config['prefixes'][$language->id]) && $config['prefixes'][$language->id] == $prefix) {
@@ -104,7 +104,7 @@ public function processInbound($path, Request $request) {
     $parts = explode('/', $path);
     $prefix = array_shift($parts);
 
-    // Search prefix within enabled languages.
+    // Search prefix within added languages.
     foreach ($this->languageManager->getLanguages() as $language) {
       if (isset($config['prefixes'][$language->id]) && $config['prefixes'][$language->id] == $prefix) {
         // Rebuild $path with the language removed.
@@ -132,7 +132,7 @@ public function processOutbound($path, &$options = array(), Request $request = N
       $language_url = $this->languageManager->getCurrentLanguage(Language::TYPE_URL);
       $options['language'] = $language_url;
     }
-    // We allow only enabled languages here.
+    // We allow only added languages here.
     elseif (!is_object($options['language']) || !isset($languages[$options['language']->id])) {
       return $path;
     }
diff --git a/core/modules/language/lib/Drupal/language/Tests/LanguageListTest.php b/core/modules/language/lib/Drupal/language/Tests/LanguageListTest.php
index 273850b5a4ab1188593d67a49677d4609cfe56a1..d5abded8ea1d0ec090e7f3f22079cdbf1ef7c99e 100644
--- a/core/modules/language/lib/Drupal/language/Tests/LanguageListTest.php
+++ b/core/modules/language/lib/Drupal/language/Tests/LanguageListTest.php
@@ -126,7 +126,7 @@ function testLanguageList() {
     $languages = $this->container->get('language_manager')->getLanguages();
     // We need raw here because %language and %langcode will add HTML.
     $t_args = array('%language' => 'French', '%langcode' => 'fr');
-    $this->assertRaw(t('The %language (%langcode) language has been removed.', $t_args), 'Disabled language has been removed.');
+    $this->assertRaw(t('The %language (%langcode) language has been removed.', $t_args), 'The French language has been removed.');
     $this->assertEqual($this->getUrl(), url('admin/config/regional/language', array('absolute' => TRUE)), 'Correct page redirection.');
     // Verify that language is no longer found.
     $this->drupalGet('admin/config/regional/language/delete/fr');
diff --git a/core/modules/language/lib/Drupal/language/Tests/LanguageUILanguageNegotiationTest.php b/core/modules/language/lib/Drupal/language/Tests/LanguageUILanguageNegotiationTest.php
index 169bfcf0a209c1d074c11884773fd5f3c2827342..1a2e5d612ea877024b03bd5277c8633f1a0c94af 100644
--- a/core/modules/language/lib/Drupal/language/Tests/LanguageUILanguageNegotiationTest.php
+++ b/core/modules/language/lib/Drupal/language/Tests/LanguageUILanguageNegotiationTest.php
@@ -32,7 +32,7 @@
  * 2. URL (PATH) > BROWSER > DEFAULT
  *        admin/config
  *          UI in user's browser language preference if the site has that
- *          language enabled, if not, the default language
+ *          language added, if not, the default language
  *        zh-hans/admin/config
  *          UI in Chinese
  *        blah-blah/admin/config
diff --git a/core/modules/locale/lib/Drupal/locale/Tests/LocaleExportTest.php b/core/modules/locale/lib/Drupal/locale/Tests/LocaleExportTest.php
index c0ceb052fd662cd4a2d4bd00eb86168104f84610..cf69ddbb11d0e652e2c9abc0211b16e79b28e549 100644
--- a/core/modules/locale/lib/Drupal/locale/Tests/LocaleExportTest.php
+++ b/core/modules/locale/lib/Drupal/locale/Tests/LocaleExportTest.php
@@ -50,7 +50,7 @@ function setUp() {
    */
   function testExportTranslation() {
     // First import some known translations.
-    // This will also automatically enable the 'fr' language.
+    // This will also automatically add the 'fr' language.
     $name = tempnam('temporary://', "po_") . '.po';
     file_put_contents($name, $this->getPoFile());
     $this->drupalPostForm('admin/config/regional/translate/import', array(
diff --git a/core/modules/locale/lib/Drupal/locale/Tests/LocalePluralFormatTest.php b/core/modules/locale/lib/Drupal/locale/Tests/LocalePluralFormatTest.php
index b1982f65dee8609dfd4a9c369aa20bf17b59b536..c8adf970c29f0b42724200bc89dd389e5b9a8b31 100644
--- a/core/modules/locale/lib/Drupal/locale/Tests/LocalePluralFormatTest.php
+++ b/core/modules/locale/lib/Drupal/locale/Tests/LocalePluralFormatTest.php
@@ -41,7 +41,7 @@ function setUp() {
    */
   function testGetPluralFormat() {
     // Import some .po files with formulas to set up the environment.
-    // These will also add the languages to the system and enable them.
+    // These will also add the languages to the system.
     $this->importPoFile($this->getPoFileWithSimplePlural(), array(
       'langcode' => 'fr',
     ));
@@ -142,7 +142,7 @@ function testGetPluralFormat() {
    */
   function testPluralEditExport() {
     // Import some .po files with formulas to set up the environment.
-    // These will also add the languages to the system and enable them.
+    // These will also add the languages to the system.
     $this->importPoFile($this->getPoFileWithSimplePlural(), array(
       'langcode' => 'fr',
     ));
diff --git a/core/modules/locale/lib/Drupal/locale/Tests/LocaleUpdateTest.php b/core/modules/locale/lib/Drupal/locale/Tests/LocaleUpdateTest.php
index 81a1ac655d10144a3347e13e40475ef574340b17..268f72fa6bd8c8d8e9cc8a8e6856eebb8f64bb17 100644
--- a/core/modules/locale/lib/Drupal/locale/Tests/LocaleUpdateTest.php
+++ b/core/modules/locale/lib/Drupal/locale/Tests/LocaleUpdateTest.php
@@ -342,7 +342,7 @@ function testEnableUninstallModule() {
   }
 
   /**
-   * Tests automatic translation import when a langauge is enabled.
+   * Tests automatic translation import when a langauge is added.
    *
    * When a language is added, the system will check for translations files of
    * enabled modules and will import them. When a language is removed the system
@@ -390,7 +390,7 @@ function testEnableLanguage() {
   }
 
   /**
-   * Tests automatic translation import when a custom langauge is enabled.
+   * Tests automatic translation import when a custom langauge is added.
    */
   function testEnableCustomLanguage() {
     // Make the hidden test modules look like a normal custom module.
@@ -402,7 +402,7 @@ function testEnableCustomLanguage() {
     );
     $this->drupalPostForm('admin/modules', $edit, t('Save configuration'));
 
-    // Create and enable a custom language with language code 'xx' and a random
+    // Create a custom language with language code 'xx' and a random
     // name.
     $langcode = 'xx';
     $name = $this->randomName(16);
diff --git a/core/modules/locale/locale.bulk.inc b/core/modules/locale/locale.bulk.inc
index f75a23e69a7f786dc89a7d93410e444470bedc20..06c08874f7c941b5363467205e1321d13d28e27e 100644
--- a/core/modules/locale/locale.bulk.inc
+++ b/core/modules/locale/locale.bulk.inc
@@ -45,7 +45,7 @@ function locale_translate_batch_import_files($options, $force = FALSE) {
   }
   else {
     // If langcode was not provided, make sure to only import files for the
-    // languages we have enabled.
+    // languages we have added.
     $langcodes = array_keys(\Drupal::languageManager()->getLanguages());
   }
 
diff --git a/core/modules/locale/locale.module b/core/modules/locale/locale.module
index afb4047df228cd509dc8a742a83f99ff8a33d67d..039d51a797dc184ec18476e79c054d29a3698a4f 100644
--- a/core/modules/locale/locale.module
+++ b/core/modules/locale/locale.module
@@ -4,7 +4,7 @@
  * @file
  * Enables the translation of the user interface to languages other than English.
  *
- * When enabled, multiple languages can be set up. The site interface can be
+ * When enabled, multiple languages can be added. The site interface can be
  * displayed in different languages, and nodes can have languages assigned. The
  * setup of languages and translations is completely web based. Gettext portable
  * object files are supported.
diff --git a/core/modules/node/lib/Drupal/node/NodeListBuilder.php b/core/modules/node/lib/Drupal/node/NodeListBuilder.php
index 51b24855a037fa29452fd73c29ce2b66d8c5edcc..fc9c0ba7f350662801a3eaa4c05547d9fcb0f83f 100644
--- a/core/modules/node/lib/Drupal/node/NodeListBuilder.php
+++ b/core/modules/node/lib/Drupal/node/NodeListBuilder.php
@@ -61,7 +61,7 @@ public static function createInstance(ContainerInterface $container, EntityTypeI
    * {@inheritdoc}
    */
   public function buildHeader() {
-    // Enable language column and filter if multiple languages are enabled.
+    // Enable language column and filter if multiple languages are added.
     $header = array(
       'title' => $this->t('Title'),
       'type' => array(
diff --git a/core/modules/search/lib/Drupal/search/Tests/SearchLanguageTest.php b/core/modules/search/lib/Drupal/search/Tests/SearchLanguageTest.php
index c7b51c842177fca43141b479784b8970eb98618e..7cdf0bd652a3550079aeb0a1c367f7d4ff7e92fc 100644
--- a/core/modules/search/lib/Drupal/search/Tests/SearchLanguageTest.php
+++ b/core/modules/search/lib/Drupal/search/Tests/SearchLanguageTest.php
@@ -25,7 +25,7 @@ class SearchLanguageTest extends SearchTestBase {
   public static function getInfo() {
     return array(
       'name' => 'Search language selection',
-      'description' => 'Tests advanced search with different languages enabled.',
+      'description' => 'Tests advanced search with different languages added.',
       'group' => 'Search',
     );
   }
diff --git a/core/modules/user/lib/Drupal/user/AccountForm.php b/core/modules/user/lib/Drupal/user/AccountForm.php
index f85fca27904fe1e883bb67ff2ca11fb58eb012cc..f650c07275358ec846d464d8cda9f76f576a9e8b 100644
--- a/core/modules/user/lib/Drupal/user/AccountForm.php
+++ b/core/modules/user/lib/Drupal/user/AccountForm.php
@@ -237,11 +237,11 @@ public function form(array $form, array &$form_state) {
 
     $user_preferred_admin_langcode = $register ? $language_interface->id : $account->getPreferredAdminLangcode();
 
-    // Is the user preferred language enabled?
-    $user_language_enabled = FALSE;
+    // Is the user preferred language added?
+    $user_language_added = FALSE;
     if ($this->languageManager instanceof ConfigurableLanguageManagerInterface) {
       $negotiator = $this->languageManager->getNegotiator();
-      $user_language_enabled = $negotiator && $negotiator->isNegotiationMethodEnabled(LanguageNegotiationUser::METHOD_ID, Language::TYPE_INTERFACE);
+      $user_language_added = $negotiator && $negotiator->isNegotiationMethodEnabled(LanguageNegotiationUser::METHOD_ID, Language::TYPE_INTERFACE);
     }
     $form['language'] = array(
       '#type' => $this->languageManager->isMultilingual() ? 'details' : 'container',
@@ -257,7 +257,7 @@ public function form(array $form, array &$form_state) {
       '#title' => $this->t('Site language'),
       '#languages' => Language::STATE_CONFIGURABLE,
       '#default_value' => $user_preferred_langcode,
-      '#description' => $user_language_enabled ? $this->t("This account's preferred language for e-mails and site presentation.") : $this->t("This account's preferred language for e-mails."),
+      '#description' => $user_language_added ? $this->t("This account's preferred language for e-mails and site presentation.") : $this->t("This account's preferred language for e-mails."),
     );
 
     // Only show the account setting for Administration pages language to users
diff --git a/core/modules/views/lib/Drupal/views/Tests/Entity/RowEntityRenderersTest.php b/core/modules/views/lib/Drupal/views/Tests/Entity/RowEntityRenderersTest.php
index becbeaf6c9284813c0df3153107bdba84180d879..869ad8835bf432732f61756420e9711c0e59bf67 100644
--- a/core/modules/views/lib/Drupal/views/Tests/Entity/RowEntityRenderersTest.php
+++ b/core/modules/views/lib/Drupal/views/Tests/Entity/RowEntityRenderersTest.php
@@ -33,7 +33,7 @@ class RowEntityRenderersTest extends ViewUnitTestBase {
   public static $testViews = array('test_entity_row_renderers');
 
   /**
-   * An array of enabled languages.
+   * An array of added languages.
    *
    * @var array
    */
diff --git a/core/modules/views_ui/lib/Drupal/views_ui/Tests/ViewEditTest.php b/core/modules/views_ui/lib/Drupal/views_ui/Tests/ViewEditTest.php
index 1693888d3a4f7359f3799a4d122d47a3b50b7fdf..8e35fbc8f7215686730f2604d12c00da6b6975e1 100644
--- a/core/modules/views_ui/lib/Drupal/views_ui/Tests/ViewEditTest.php
+++ b/core/modules/views_ui/lib/Drupal/views_ui/Tests/ViewEditTest.php
@@ -101,7 +101,7 @@ public function testEditFormOtherOptions() {
     $langcode_url = 'admin/structure/views/nojs/display/test_view/default/field_langcode';
     $this->assertLinkByHref($langcode_url);
     $this->assertLink(t("Current user's language"));
-    // Click the link and check the form before language is enabled.
+    // Click the link and check the form before language is added.
     $this->drupalGet($langcode_url);
     $this->assertResponse(200);
     $this->assertText(t("You don't have translatable entity types."));
diff --git a/sites/default/default.settings.php b/sites/default/default.settings.php
index b2ce930eff03beac67c0642f521c6adc064c4178..9fa9dde5fe5abc46686f606e46a431e25de2716b 100644
--- a/sites/default/default.settings.php
+++ b/sites/default/default.settings.php
@@ -491,7 +491,7 @@
  * Remove the leading hash signs to enable.
  *
  * The "en" part of the variable name, is dynamic and can be any langcode of
- * any enabled language. (eg locale_custom_strings_de for german).
+ * any added language. (eg locale_custom_strings_de for german).
  */
 # $settings['locale_custom_strings_en'][''] = array(
 #   'forum'      => 'Discussion board',