Issue #3329823 by idebr: ExtraFieldDisplayFormattedBase declares an empty...

Issue #3329823 by idebr: ExtraFieldDisplayFormattedBase declares an empty 'languageManager' property as LanguageManagerInterface

src/Plugin/ExtraFieldDisplayFormattedBase.php

@@ -32,13 +32,6 @@ abstract class ExtraFieldDisplayFormattedBase extends ExtraFieldDisplayBase impl
    */
   protected $langcode = LanguageInterface::LANGCODE_NOT_SPECIFIED;
 
-  /**
-   * The language manager.
-   *
-   * @var \Drupal\Core\Language\LanguageManagerInterface
-   */
-  protected $languageManager;
-
   /**
    * {@inheritdoc}
    */