LanguageManagerInterface

class \Drupal\Core\Language\LanguageManager implements \Drupal\Core\Language\LanguageManagerInterface uses \Drupal\Core\DependencyInjection\DependencySerializationTrait
class \Drupal\language\ConfigurableLanguageManager extends \Drupal\Core\Language\LanguageManager implements \Drupal\language\ConfigurableLanguageManagerInterface

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