diff --git a/core/modules/config_translation/src/ConfigMapperInterface.php b/core/modules/config_translation/src/ConfigMapperInterface.php
index ac3d531..f794a10 100644
--- a/core/modules/config_translation/src/ConfigMapperInterface.php
+++ b/core/modules/config_translation/src/ConfigMapperInterface.php
@@ -205,22 +205,6 @@ public function getConfigData();
   public function getLangcode();
 
   /**
-   * Returns language object for the configuration.
-   *
-   * If the language of the configuration files is not a configured language on
-   * the site and it is English, we return a dummy language object to represent
-   * the built-in language.
-   *
-   * @return \Drupal\Core\Language\LanguageInterface
-   *   A configured language object instance or a dummy English language object.
-   *
-   * @throws \RuntimeException
-   *   Throws an exception if the language codes in the config files don't
-   *   match.
-   */
-  public function getLanguageWithFallback();
-
-  /**
    * Returns the name of the type of data the mapper encapsulates.
    *
    * @return string
diff --git a/core/modules/config_translation/src/ConfigNamesMapper.php b/core/modules/config_translation/src/ConfigNamesMapper.php
index ee1d0ac..ca4e8d8 100644
--- a/core/modules/config_translation/src/ConfigNamesMapper.php
+++ b/core/modules/config_translation/src/ConfigNamesMapper.php
@@ -410,24 +410,6 @@ public function getLangcode() {
   /**
    * {@inheritdoc}
    */
-  public function getLanguageWithFallback() {
-    $langcode = $this->getLangcode();
-    $language = $this->languageManager->getLanguage($langcode);
-    // If the language of the file is English but English is not a configured
-    // language on the site, create a mock language object to represent this
-    // language run-time. In this case, the title of the language is
-    // 'Built-in English' because we assume such configuration is shipped with
-    // core and the modules and not custom created. (In the later case an
-    // English language configured on the site is assumed.)
-    if (empty($language) && $langcode == 'en') {
-      $language = new Language(array('id' => 'en', 'name' => $this->t('Built-in English')));
-    }
-    return $language;
-  }
-
-  /**
-   * {@inheritdoc}
-   */
   public function getConfigData() {
     $config_data = array();
     foreach ($this->getConfigNames() as $name) {
diff --git a/core/modules/config_translation/src/Controller/ConfigTranslationController.php b/core/modules/config_translation/src/Controller/ConfigTranslationController.php
index 72fe9cc..9c7fd67 100644
--- a/core/modules/config_translation/src/Controller/ConfigTranslationController.php
+++ b/core/modules/config_translation/src/Controller/ConfigTranslationController.php
@@ -127,18 +127,12 @@ public function itemPage(Request $request, RouteMatchInterface $route_match, $pl
     $page = array();
     $page['#title'] = $this->t('Translations for %label', array('%label' => $mapper->getTitle()));
 
-    // It is possible the original language this configuration was saved with is
-    // not on the system. For example, the configuration shipped in English but
-    // the site has no English configured. Represent the original language in
-    // the table even if it is not currently configured.
     $languages = $this->languageManager->getLanguages();
     $original_langcode = $mapper->getLangcode();
     if (!isset($languages[$original_langcode])) {
+      // If the language is not configured on the site, create a dummy language
+      // object for this listing only to ensure the user gets useful info.
       $language_name = $this->languageManager->getLanguageName($original_langcode);
-      if ($original_langcode == 'en') {
-        $language_name = $this->t('Built-in English');
-      }
-      // Create a dummy language object for this listing only.
       $languages[$original_langcode] = new Language(array('id' => $original_langcode, 'name' => $language_name));
     }
 
diff --git a/core/modules/config_translation/src/Form/ConfigTranslationFormBase.php b/core/modules/config_translation/src/Form/ConfigTranslationFormBase.php
index 2831fd9..9e5372f 100644
--- a/core/modules/config_translation/src/Form/ConfigTranslationFormBase.php
+++ b/core/modules/config_translation/src/Form/ConfigTranslationFormBase.php
@@ -144,7 +144,7 @@ public function buildForm(array $form, FormStateInterface $form_state, Request $
 
     $this->mapper = $mapper;
     $this->language = $language;
-    $this->sourceLanguage = $this->mapper->getLanguageWithFallback();
+    $this->sourceLanguage = $this->languageManager->getLanguage($this->mapper->getLangcode());
 
     // Get base language configuration to display in the form before setting the
     // language to use for the form. This avoids repetitively settings and
diff --git a/core/modules/language/language.module b/core/modules/language/language.module
index f66bff2..ae8c2e2 100644
--- a/core/modules/language/language.module
+++ b/core/modules/language/language.module
@@ -161,21 +161,6 @@ function language_process_language_select($element) {
       $element['#options'][$langcode] = $language->isLocked() ? t('- @name -', array('@name' => $language->getName())) : $language->getName();
     }
   }
-  // Add "Built-in English" language to the select when the default value is
-  // set to English but it does not exist in the options list.
-  //
-  // Drupal core includes configuration shipped in English, including default
-  // views, content types, user roles, filter formats, etc. To keep the Drupal
-  // software update-able, as well as translations update-able, we keep these
-  // configuration files in English even when installed in a foreign language.
-  // However, administrators can remove English, in which case editing such a
-  // configuration would lead to the language settings being changed on it. We
-  // avoid that by including this option and letting administrators keep it
-  // in English.
-  if (isset($element['#default_value']) && $element['#default_value'] == 'en' && !isset($element['#options']['en'])) {
-    // Prepend the default language at the beginning of the list.
-    $element['#options'] = array('en' => t('Built-in English')) + $element['#options'];
-  }
   return $element;
 }
 
diff --git a/core/modules/locale/src/LocaleConfigSubscriber.php b/core/modules/locale/src/LocaleConfigSubscriber.php
index efe694e..ee20daf 100644
--- a/core/modules/locale/src/LocaleConfigSubscriber.php
+++ b/core/modules/locale/src/LocaleConfigSubscriber.php
@@ -135,7 +135,7 @@ protected function updateLocaleStorage(StorableConfigBase $config, $langcode, ar
    *   The active configuration data or override data.
    * @param array|\Drupal\Core\StringTranslation\TranslationWrapper[] $translatable
    *   The translatable array structure.
-   *   @see \Drupal\locale\LocaleConfigManager::getTranslatableData().
+   *   @see \Drupal\locale\LocaleConfigManager::getTranslatableData()
    * @param string $langcode
    *   The language code to process the array with.
    * @param array $reference_config