Fix testsuite

See merge request !121

Resolve "`aleksis-admin yarn install` needs a database"

Closes #126

See merge request !122

Closes #126 — module loading must not have side effects, and
generating the predicates calls the database.

Under normal operation, cache_memoize and/or django-cachalot ensure
the database lookup is not done on every permission check.

Resolve "Add task for checking plausibility of data"

Closes #91

See merge request !92

Update tox.ini. Advances AlekSIS-Core#338

See merge request !119

Update tox.ini. Advances AlekSIS-Core#338

See merge request !118

Update poetry.lock

See merge request !117

Resolve "Add never_cache decorators"

Closes #90

See merge request !116

Resolve "Do not allow entries in holidays (configurable)"

Closes #112

See merge request !101

Resolve "Fix circle icons"

Closes #118

See merge request !114

Resolve "Group members are counted multiple times in "My groups""

Closes #123

See merge request !113

Currently translated at 100.0% (181 of 181 strings)

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

[Lesson view] Use correct label for remarks field in personal notes form

See merge request !112