@Override
    public void save(ActionEvent... actionEvent) {
        infoLabel.setText("Saving...");
        saveJson(getJSON());
        fadeOut(infoLabel, "Saved...");
    }
Set additional attributes in the GUI.
Only needed if child class has additional elements which are not shown
in the parent class.
@param childClassAttributes
@see AsciidoctorConfigBase#load(Path, ActionEvent...)
src/main/java/com/kodedu/config/AsciidoctorConfigBase.java