To add new language you have to:
1) Add new lnaguage in file /home/root/.gconf/apps/er/sys/global/%gconf.xml
2) Add support libraries in /usr/lib/gconv (for 8-bit codepages)
3) Add locales in /usr/lib/locale
4) Add text translation files (*.mo files) in /usr/share/locale/ru_RU/LC_MESSAGES
5) Add new language text in shortcuts in /etc/desktop
6) reboot
7) Select new language.