diff -u b/core/modules/content_translation/lib/Drupal/content_translation/Controller/ContentTranslationController.php b/core/modules/content_translation/lib/Drupal/content_translation/Controller/ContentTranslationController.php
--- b/core/modules/content_translation/lib/Drupal/content_translation/Controller/ContentTranslationController.php
+++ b/core/modules/content_translation/lib/Drupal/content_translation/Controller/ContentTranslationController.php
@@ -11,7 +11,7 @@
 use Drupal\Core\Language\Language;
 use Drupal\Core\Entity\EntityInterface;
 use Drupal\Core\Entity\ContentEntityInterface;
-use \Drupal\Core\Controller\ControllerBase;
+use Drupal\Core\Controller\ControllerBase;
 
 /**
  * Base class for entity translation controllers.
@@ -20,6 +20,12 @@
 
   /**
    * Translations overview page callback.
+   *
+   * @param \Symfony\Component\HttpFoundation\Request $request
+   *   The request obkect.
+   *
+   * @return array
+   *   A processed build array ready to be rendered.
    */
   public function overview(Request $request) {
     $entity = $request->attributes->get($request->attributes->get('_entity_type_id'));
@@ -151,20 +157,18 @@
   /**
    * Page callback for the translation addition page.
    *
-   * @param EntityInterface $entity
-   *   The entity being translated.
-   * @param Language $source
-   *   (optional) The language of the values being translated. Defaults to the
-   *   entity language.
-   * @param Language $target
-   *   (optional) The language of the translated values. Defaults to the current
-   *   content language.
+   * @param \Symfony\Component\HttpFoundation\Request $request
+   *   The request obkect.
+   * @param string $source
+   *   The source language.
+   * @param string $target
+   *   The target language.
    *
    * @return array
    *   A processed form array ready to be rendered.
    *
    */
-  public function add(Request $request, $source, $target) {
+  public function add(Request $request,$source,$target) {
     $entity = $request->attributes->get($request->attributes->get('_entity_type_id'));
     $source = language_load($source);
     $target = language_load($target);
@@ -182,16 +186,15 @@
   /**
    * Page callback for the translation edit page.
    *
-   * @param \Drupal\Core\Entity\EntityInterface $entity
-   *   The entity being translated.
-   * @param \Drupal\Core\Language\Language $language
-   *   (optional) The language of the translated values. Defaults to the current
-   *   content language.
+   * @param \Symfony\Component\HttpFoundation\Request $request
+   *   The request obkect.
+   * @param string $language
+   *   The language for the translation edit page.
    *
    * @return array
    *   A processed form array ready to be rendered.
    */
-  public function edit(Request $request, $language) {
+  public function edit(Request $request,$language) {
     $entity = $request->attributes->get($request->attributes->get('_entity_type_id'));
     $language = language_load($language);
     $language = !empty($language) ? $language : $this->languageManager()->getCurrentLanguage(Language::TYPE_CONTENT);
@@ -215,7 +218,7 @@
       // If content language is set up to fall back to the interface language,
       // then there will be no switch links for Language::TYPE_CONTENT, ergo we
       // also need to use interface switch links.
-    $links = $this->languageManager()->getLanguageSwitchLinks(Language::TYPE_INTERFACE, $path);
+      $links = $this->languageManager()->getLanguageSwitchLinks(Language::TYPE_INTERFACE, $path);
     }
     return $links;
   }
@@ -224,7 +227,7 @@
    * Populates target values with the source values.
    *
    * @param \Drupal\Core\Entity\EntityInterface $entity
-   *   The entitiy being translated.
+   *   The entity being translated.
    * @param \Drupal\Core\Language\Language $source
    *   The language to be used as source.
    * @param \Drupal\Core\Language\Language $target