Well, if you really need permission from RGG only, not from language-version publisher, then I think we're quite ready with the Polish version. As Unclelion wrote, the official translations are done for Base set, Intrigue, Seaside, Prosperity, Cornucopia and Empires, and I've done translations for the rest of the expansions (card text and card descriptions from rulebooks).
Doing the actual translations is actually only a small part of the work. Getting them to look good online is another. If you're interested in helping out with that, feel free to message Stef.