private function createLanguageTranslationToken($locale, $translation, TranslationToken $token)
 {
     $language = new Language();
     $language->setLocale($locale);
     $languageTranslationToken = new LanguageTranslationToken();
     $languageTranslationToken->setLanguage($language);
     $languageTranslationToken->setTranslation($translation);
     $token->addLanguageTranslationToken($languageTranslationToken);
     self::$em->persist($language);
     self::$em->persist($languageTranslationToken);
     self::$em->flush();
     return $languageTranslationToken;
 }