Yeah.. actually if you run goodtools with the default options the roms are sorted into folders based on region.... also unless you are really dim all you have to do to sort by language is to sort by the region code ( [ u ] = u.s. [j]=japan, ect....)
While I can understand how this would be useful to our multilingual friends, I dont see what purpose it'd serve for us dumb americans. Personally I can speak English, enough Spanish to Save my life and myabe a few slavic curse words.
There are only two countries who actually make games and release them exclusively in their region, namely the US and Japan. So if there's an english release of a game, it'll be available in all major european languages or at the very least, english, which everyone seems to know. If it's a japanese only release, then it is only released in that language, and the number of non-japanese that speak japanese is very limited.
Again, to me the best course seems to be to sort by country and just leave it at that.