docs: public static String getLanguageCode(String wikimediaLanguageCode) {
  		if (LANGUAGE_CODES.containsKey(wikimediaLanguageCode)) {
  			return LANGUAGE_CODES.get(wikimediaLanguageCode);
  		} else {
  			throw new IllegalArgumentException("Unknown Wikimedia language \""
  					+ wikimediaLanguageCode + "\".");
  		}
  
  	}