Hi TATYANA BYKOVA,

Can you try install russian language at Joomla Language Manager #set as and Komento russian language #both languages are required#

http://screen.stackideas.com/joomla_russian_language.png
http://screen.stackideas.com/set_as_default.png
http://stackideas.com/component/billings/?controller=download&task=translation&joomla=25&extension=com_komento&language=ru_RU

http://screen.stackideas.com/ru-RU.png
Do let us know if you required any assistance