Allow selecting next exercise with enter key

[senekor]

No description provided.

[mo8it]

I agree that Enter is more intuitive. But then I would remove c. It should be added to the footer.

[mo8it]

I remember now why I didn't choose Enter: I didn't know how to show it in the footer while staying consistent with the other keys. Maybe just Enter: continue at?

[senekor]

I think c is actually fine too. I'd guess there are two types of people: Some check the footer to find out what to do. Those will use c, as indicated. Others will hit enter blindly, assuming it'll work, because it's intuitive (that's me). Both are fine, and I don't think it would bother anyone that only one option shows up in the footer.

[mo8it]

I don't like it when an option is not defined. If I hit enter, I want to be able to look up what exactly it does.
Could you then just add Enter/ to the footer?

[senekor]

Sure. There's also a unicode symbol, just like for the up and down arrows:

Although I'm not sure if all terminal fonts render this well. What do you prefer, symbol or just "Enter" ?

This will cause an (easy to fix) merge conflict with #2381, just to keep in mind.