If you know anyone with a good grasp of both English and Russia, (and a knowledge of programming), you could give them the source code and tell them to give you the edited source or the binaries. But that'd have to happen every time there was an update, though.
My suggestion: TPT is mostly graphical, if you can understand the instructions and descriptions, you should be fine.
If you want, you (or someone else) can write up simple .txt file detailing what each element does in Russian and tell Simon to include it.
I have already compile TPT but when I write in Russian instead of letters there are different symbols. What's the matter. A txt-file I will try to write. (Excuse for illiteracy, my language - Russian. )
char *it_msg = "\brThe Powder Toy - Игры Ñ Ð¿Ð¾Ñ€Ð¾Ñ...ом\n" "\x7F\x7F\x7F\x7F\x7F\x7F\x7F\x7F\x7F\x7F\x7F\x7F\x7F\x7F\x7F\x7F\x7F\x7F\x7F\n" "\n" "\bgControl+C/V/X are Copy, Paste and cut respectively.\n" "\bgTo choose a material, hover over once of the icons on the right, it will show a selection of elements in that group.\n" ... [imgs=http://notebook.amal-isa.operaunite.com/photo_sharing/][/imgs] (password 1111)