This example shows overwritten i18n properties, in this case the text of the button above. See overwrite.properties for default (English) and overwrite_de.properties for German text. The usage of these property files is indicated by the resourcebase applet tag.
Furthermore the File menu and export menu use special text and mnemonics, see the GUI description file Overwritten.xml and the property files, too.
Thanks to Oracle's slow reactions to security flaws in the applet runtime environment many modern browsers restrict applet execution in various ways. You may even see nothing above in some cases, not even the hint that you should enable Java in your browser when no applet is displayed on this page.
If you want to use the applet on your own page, here is what you can do.