code: public boolean isSupportedLanguage(String language) {
          String lang = getLanguageComponent(language);
          return languageLookup.containsKey(lang);
      }
docs: Returns true if the language component is supported by this application.
  <p>
  For example, this application may have Portuguese (pt) as a registered
  language but not Brazilian Portuguese (pt-BR). In this case, pt-BR would
  be supported because of the pt registration.
  </p>
  
  @param language
  @return true if the language is supported