Impressive! Grig de Griz found a way to implement cyrillic letters inside MOO2. He completed his russian translation of MOO2 (based on 1.31) a few weeks ago. Take a look:
For example, the Racestuf screen...
...and even the system names were translated!
Currently, the localization is still based on 1.31 but LordBrazen has already provided a modified 1.4patcher for the Russian 1.31. Probably, there might be a Russian 1.4 version pretty soon!
The current version can be downloaded here: http://www.mo3.fatal.ru/moo2tfiles.htm
There is also a MOO2 discussion forum on his site to discuss his mod and (forthcoming) MOO2 tools: http://www.mo3.fatal.ru/forum/forums.php?forum=19
(I have also added it to the sidebar.)
You should have no worries to install the files, they can coexist with the English 1.31/1.40 versions.