I guess this is not a big issue, may be just a file that is not writable by server or something similar, but it seams that when I change a language in the personal setting, the next time you log in it changes back to English, so it doesn't get saved!
How to fix this?
regards Ivan
//www.riznica.net
Language setting is stored in database .. (table: users, col: language) .. try to watch the database what happen there after changing language in Roundcube and logout/login.