On the SoFA forums we use language tags whenever we make a post, to help consolidate content in the same language. By using these tags on every post, you help other members easily sort through content in their language(s) of use.
To set your topic languages, simply navigate to your post and click on “topic language” like this.
Select the language your post is in the press enter.
That’s it! You can add multiple topic languages if your post requires it.