I have a very special problem with
SharedMediaAdditionalFonts, it works fine on my German client but when I change the language to russian and create a char on a russian server the fonts are not loaded! Someone using my UI had this problem and I tested it out myself with the latest version to confirm.
As you can see in this screenshot AddOn loaded but you can't select other fonts:
http://i.imgur.com/KZgViis.jpg
I also tested it with Cyrillic fonts.
Pb_ee1 the author of the AddOn stated that "all the fonts are actually registered to SharedMedia fully, however, I do have the same issue as you: they do not appear in the list of selectable fonts" and looks like he is out of ideas how to fix this.
So maybe someone else here has an idea!
To test yourself:
1. Change language in bnet client to russian then restart bnet
2. Open wow and change wow language to russian then close wow and restart bnet again
3. Open bnet and wow now you can create a char on russian server!