There's really no reason it couldn't service other languages as it is. There's admittedly no language filter, but topics could be made to allow people who don't primarily speak English to find one another and discuss things together.

If you'd like to see more variety in languages, just invite friends who speak the language you want to see better represented and help get that ball rolling ;). Language oriented features would only help if enough people were using it, so that's the first step.