The reason I gave it a 4/5 is I only know that you can use properties files

Directory Jain I18N
1

The reason I gave it a 4/5 is I only know that you can use properties files.

I would like to see something like what Wicket does with properties.xml files.

https://cwiki.apache.org/WICKET/everything-about-wicket-internationalization.html

2

This can be easily achieved by implementing your own I18N provider and overriding getI18nProvider() method of I18NUI.