code: public static void addMapLocale(@NonNull Locale locale, @NonNull MapLocale mapLocale) {
      LOCALE_SET.put(locale, mapLocale);
    }
docs: When creating a new MapLocale, you'll need to associate a {@link Locale} so that
  {@link Locale#getDefault()} will find the correct corresponding {@link MapLocale}.
  
  @param locale    a valid {@link Locale} instance shares a 1 to 1 relationship with the
  {@link MapLocale}
  @param mapLocale the {@link MapLocale} which shares a 1 to 1 relationship with the
  {@link Locale}
  @since 0.1.0