For the default skin the Language art is located at
\YAMJ\skins\default\resources\languages
and will relate to the <language>af</language> in the Jukebox XML file.
So in the above example adding a af.png
But easier said than done. To get YAMJ to recognise the language and apply the changes was a bit more difficult.
The most important thing is to set <id>-1</id> in the movie XML file for the spesific movie and change the language.
After that rerun My_YAMJ.cmd
This will not scrape the internet but rather use the settings in the XML file.