Language Bug

One day, I installed Minecraft 1.6+. Now I can't write on Russian, Turkish, Canadian and much more languages (I've tested these 3)
My Windows-friends can write on all languages
But all of my MAC-friends have the same problem
I think it's a problem for all Unix users

Steps to Reproduce:
1) Launch any 1.6+ version of Minecraft on MAC
2) Switch to russian language
3) Try to type something in Multiplayer/Singleplayer