code: public Map<String, String> getDefaultLanguage(String appid) {
  		if (!LANG_CACHE.containsKey(getDefaultLanguageCode())) {
  			logger.info("Default language map not set, loading English.");
  			Map<String, String> deflang = readLanguageFromFile(appid, getDefaultLanguageCode());
  			if (deflang != null && !deflang.isEmpty()) {
  				LANG_CACHE.put(getDefaultLanguageCode(), deflang);
  				return Collections.unmodifiableMap(deflang);
  			}
  		}
  		return Collections.unmodifiableMap(LANG_CACHE.get(getDefaultLanguageCode()));
  	}
docs: Returns the default language map.
  @param appid appid name of the {@link com.erudika.para.core.App}
  @return the default language map or an empty map if the default isn't set.