Typo in german Solution Page title

[Sk1nk]

If you \printsolution while on the german version, The title is "Lösung zu den Aufgabeen", which is one E to many.

[Sk1nk]

I think the mistake is on my side. It works fine, as long as exercises are "Übung" (Übung-en), but if I switch to \XSIMtranslate{question}, they are "Aufgabe" (Aufgabe-en) and there is an E to many.

[flortsch]

Your commit 8574137 fixed this issue for "Aufgabe", but introduced the same issue for "Übung" which is now printed as "Übungn". So both names can't be handled in the same way.