Hey Valera,
I've checked with your screenshot, it seems like you point to the blog app stream title still appear English language right?
If yes, can you double check with your frontend language file is it got this file?
-> JoomlaFolder/language/en-GB/en-GB.plg_app_user_blog.ini
-> JoomlaFolder/language/ru-RU/ru-RU.plg_app_user_blog.ini
If these file exist on this path I mentioned, can you try temporary rename it? (e.g. ru-RU.plg_app_user_blog.ini_bak)
After you renamed it and see is it still populate English language? If yes, can you provide us with your Joomla backend and FTP access so we can better have a look ?