Constructs a LanguageRequestSubscriber object.
\Drupal\Core\Language\LanguageManager $language_manager: The language manager service.
\Drupal\Core\Translation\Translator\TranslatorInterface $translation: The translation service.
public function __construct(LanguageManager $language_manager, TranslatorInterface $translation) {
$this->languageManager = $language_manager;
$this->translation = $translation;
}