Open "System Settings" than click on "Language Support". Next up click on "Install/Remove languages ..." and install Russian.
After you've done that reboot your system, again navigate to "language support" and apply Russian as system-wide language.
Than reboot again and you're done.
I believe that's it, through I'm not sure, I haven't used anything but English (UK) for god knows how long time ...
Open "System Settings" than click on "Language Support". Next up click on "Install/Remove languages ..." and install Russian.
After you've done that reboot your system, again navigate to "language support" and apply Russian as system-wide language.
Than reboot again and you're done.
I believe that's it, through I'm not sure, I haven't used anything but English (UK) for god knows how long time ...