Full translation of NFC including most splashes into Russian.
Server without modified font.txt will kick you for sending Cyrillic letters to the chat. Cyrillic on signs of such a server just won't be saved. Cyrillic is allowed everywhere in books, but only players with JalC can see it, of course.
It also fix the vanilla (and NFC) “Score: &e0” bug. Rather, your score will still be zero (if you have not modify your save NBT), but this message after death will be yellow (Счёт: 0).
Does not require the installation of “Just a little Cyrillic” (already contains same font). However, if you just want to add Cyrillic support (namely letters of the Russian, Ukrainian, Belarusian and Mongolian alphabets) to the client or server, you can use JalC instead of Russian Translation. JalC doesn’t translate the game: newfrontiercraft.net/thread/120