Quoting myself
Couldn't we get a method on this site to filter posts by language used in the posts? That way someone could use his native language in a post without having to confuse all of his english speaking followers or trending page visitors. But anyone who wanted to could use and view posts both in English and in their native language at the same time.
If tagged with the relevant language tag it could occur right now but that would require user education
Let's hope it gets created. Right now you would have to click on/type in the tags to filter and that's too much user interaction for it to work well.