When Slovenian language support?

Borut, this is a question of financial implications. Apple gradually added languages as far as they may identify people who may localize/translate stuff and if the market justifies that.

If you just need a keyboard layout, try to use one closer to yours, e.g. Croatian or Serbian Latin, if available (I do not have an iPad here, but my iPhone shows that you have Serbian Cyrillic and Latin – cannot see Croatian for now; you also have Slovak, if you are familiar with a QWERTZ-based keylayout).

this is a user forum you don't speak to apple here

we can't for obvous reasons not answer your question but try this approuce

http://www.apple.com/feedback/ipad.html