/api/courses does not return all courses the user is enrolled in

[ahoereth]

The documentation states the following:

/api/courses - Belegte Veranstaltungen
Liefert die Veranstaltungen zurück, in die der Nutzer eingetragen ist.

Expected behavior: Return all courses the currently authenticated user ever enrolled in.
Actual behavior: Returns only courses the currently authenticated user enrolled in which took place in one of the last three semesters.

See routes/courses.php#L225-L238.

Side note: Same applies for /api/courses/semester: Returns just the last 3 semesters if the user enrolled in courses which took place in those. Caused by the same code snipped.

/api/courses/semester - Belegte Semester
Liefert alle Semester zurück, in denen der Nutzer in mindestens eine Veranstaltung eingetragen ist.