Benn - bent, kinn - kint, fenn - fönn - fent - fönt, lenn - lent are synonyms respectively, it would be nice if recognized as such. Or am I asking too much?
No, you are not. We need to report these wherever possible, through Report a problem. Or in general system-wide issues like this, maybe directly in the discussion forums, for the course contributors.
Tanulok bent would not work?
It should, although it sounds a bit unnatural without context, unless you're really stressing that you're studying.