diff -u b/core/lib/Drupal/Core/StringTranslation/Translator/StaticTranslation.php b/core/lib/Drupal/Core/StringTranslation/Translator/StaticTranslation.php
--- b/core/lib/Drupal/Core/StringTranslation/Translator/StaticTranslation.php
+++ b/core/lib/Drupal/Core/StringTranslation/Translator/StaticTranslation.php
@@ -55,14 +55,15 @@
   }
 
   /**
-   * Retrieve translations by given language.
+   * Retrieves translations for a given language.
    *
    * @param string $langcode
    *   The langcode of the language.
    *
    * @return array
-   *   Returns array of translations indexed by language and context or an empty
-   *   array when no translations are available.
+   *   A multidimensional array of translations indexed by the context the
+   *   source string belongs to and the original string or an empty array when
+   *   no translations are available.
    */
   protected function getLanguage($langcode) {
     // This class is usually a base class but we do not declare as abstract