Finally! I have translated Sitecore shell into Russian.
On the way I looked at the Office translation, SVN translation and many other books and sites. Main problem was whether some names should be translated at all, e.g. we don't use translation of Layout - we juts pronounce Layout. And the same thing with many other names. I guess that's because Russian is different from European languages.
Anyway, the first version is ready. I'm going to send it to Sitecore Ukraine firstly to get feedback. After that I'll publish it on SDN into Localization section which is being prepared.