MRTn : yes.. that's the most affected device because you can't have chinook. I posted about it here, and we can't compare with media default player because..
He is the player =) thus he doesn't need DBUS...
we send commands to it using DBUS, but DBUS doesn't understand non latin chars for your device / software...

And we cannot replace your DBUS, because almost the whole system depends on it.. and you would be using a Canola on a useless device... I prefer it to be a Useless canola on your usable device ...

So you have three options, even if we update to support russian etc:

1) convert at least your file names to latin chars... (don't need to convert tags tougth)
2) use another player (like the kagu or others or the default media player actually) that use mplayer, but are not heavy cpu eaters like canola...
3) use canola with mplayer... to play the audios... but this would not work as good as it would with the default media player : /

Sorry for that.. but this is unfortunately a "non-solvable" bug : /