code: public static String getDisplayLanguageWithDialect(String localeID, ULocale displayLocale) {
          return getDisplayLanguageInternal(new ULocale(localeID), displayLocale, true);
      }
docs: <strong>[icu]</strong> Returns a locale's language localized for display in the provided locale.
  If a dialect name is present in the data, then it is returned.
  This is a cover for the ICU4C API.
  @param localeID the id of the locale whose language will be displayed.
  @param displayLocale the locale in which to display the name.
  @return the localized language name.