code: public static String getString(String aKey, Object[] args)
      {
          assert (aKey != null);
  
          String pattern = getBundle().getString(aKey);
          if (args == null)
              return pattern;
  
          MessageFormat format = new MessageFormat(pattern);
          return format.format(args).toString();
      }
docs: Returns the string specified by aKey from the errors.properties bundle.
  @param aKey The key for the message pattern in the bundle.
  @param args The args to use in the message format.