Add auto translation support
In the user's profile you could let them specify what languages they can read/write.
You could do some basic ngram analysis to identify the language used in a post, and put a little flag in the corner to show what language you think it is. They could click on it to change it.
If a user is looking at text in a different language, you could have a "translate this" button, which uses google translate.
One for later on down the roadmap, but would help with international adoption.
This would be nice, but really, really low priority. Also, isn't automatic translation built-in in browsers these days? Right click -> "Translate to English" in Chrome, for example.
Safari doesn't offer that (not in such an obvious place anyway).
Yeah, wasn't think of it for any time soon...