Merge branch 'master' into 114-lesson-overview-buttons-for-switching-to-next-previous-lesson-of-the-currently-logged-in-person

Merge branch '104-remove-register-absence-from-menu-and-add-buttons-in-week-view-my-students-and-person-overview' into 'master'

Resolve "Remove "Register absence" from menu and add buttons in week view, "My students" and person overview"

Closes #104

See merge request !99

To do that, restructure page accordingly

Currently translated at 100.0% (170 of 170 strings)

Translation: AlekSIS/AlekSIS-App-Alsijil
Translate-URL: https://translate.edugit.org/projects/aleksis/aleksis-app-alsijil/de/

Currently translated at 100.0% (144 of 144 strings)

Translation: AlekSIS/AlekSIS-App-Alsijil
Translate-URL: https://translate.edugit.org/projects/aleksis/aleksis-app-alsijil/de/

Currently translated at 100.0% (144 of 144 strings)

Translation: AlekSIS/AlekSIS-App-Alsijil
Translate-URL: https://translate.edugit.org/projects/aleksis/aleksis-app-alsijil/de/

Resolve "Improve "My Students""

Closes #5, #111, and #113

See merge request !96

- My groups
- My students
- Links in week view

[Full register printout] Use school term of group

See merge request !97

Performance optimizations

Closes #107

See merge request !90

Resolve "Check (responsive) design"

Closes #94, #100 und #101

See merge request !88

Resolve "Add rules and permissions"

Closes #73 and #79

See merge request !49

 so that permissions are basing on other ones