yes. currently, we have access to "path" in MediaMonkey by using
MM.CurrentSongData path
which gives us the folder and filename of the currently playing song. So we could use the same technique as Wanilton has used in XBMC by moving music into different folders, depending on what language they are in, and then looking at the path.
However, I am adding the ability to read the occasion, and custom1 , custom2 , ... , custom5 in the next version (using MM.CurrentSongData) so you could use one of them for language if you like.
Just remember that some of these tags may be used for other things already. I'm not an expert in this area...
It is a bit odd, but there does not seem to be a tag specifically for language. Too bad.