Board Thread:General Discussion/@comment-39819853-20200305133935/@comment-1038387-20200305153257

Yes, that's the language code. Aside from the url - which is in no way harder to reach than a wiki without a code - it also translates the interface. So without the code, you'd have an English languae interface as a standard.

If it's a legitimate international topic, they may want to reserve the url without the language code for an English language wiki. But you can always ask at that form link.