code: public String key(String key, Object arg0) {
  
          return key(key, new Object[] {arg0});
      }
docs: Returns the selected localized message for the initialized resource bundle and locale.<p>
  
  Convenience method for messages with one argument.<p>
  
  @param key the message key
  @param arg0 the message argument
  
  @return the selected localized message for the initialized resource bundle and locale