public static void removeKey(LanguageKey key) {
    String _key = key.getKey();

    for (Language language : languageList) language.removeValue(_key);

    keyList.remove(key);
    keyById.remove(key.getKeyId());
    keyByKey.remove(_key);
  }
 public static void removeLanguage(Language language) {
   languageList.remove(language);
   languageById.remove(language.getLanguageId());
   languageByCode.remove(language.getCode());
 }
 public static void addLanguage(Language language) {
   languageList.add(language);
   languageById.put(language.getLanguageId(), language);
   languageByCode.put(language.getCode(), language);
 }