code: public String getPropertyValue(String key, String... parameters) {
          return getPropertyValue(new String[] { key }, parameters);
      }
docs: Searches over the group of {@code GUIProperties} for a property
  corresponding to the given key.
  
  @param key
  key to be found
  @param parameters
  instances of the {@code String} literal <code>"{n}"</code> in
  the retrieved value will be replaced by {@code params[n]}
  @return the first property found associated with a concatenation of the
  given names
  @throws MissingGUIPropertyException