Wow. It seems, it's all artifacts of old engine. :/
In database wrong name was associated with Swedish version. Even if I cannot edit name in translation at all! I re-saved Swedish translation, and extra option disappeared. Stupid engine. :/
Thank you,
cdnp, it gave me more info for thinking and experimenting...
---addition---
Gamebase is the heap of trash. As usual. Looking from site view, it's one name for every translation, but from database side, every entry have unique name, and some haven't name at all. I checked entries manually (as I haven't direct access to database), re-saving every different name. Hopefully, it will get rid of inconsistent names.
Also, I removed all apostrophes from base. Hopefully. &s are still here - I didn't touch it. Let's see, if we'll have less errors in quiz now...