Resolve "Add links to group/person detail pages in Core"

Closes #313

See merge request !419

Resolve "Missing Prop Participations on tardiness-field"

Closes #315

See merge request !424

Do release 4.0.0.dev7

See merge request !423

Do release 4.0.0.dev6

See merge request !421

Update changelog

See merge request !420

Migration path to new models

See merge request !396

Resolve "Documentation dialog should be persistent if dirty"

Closes #286

See merge request !418

Resolve "Creating absence fails / absence reasons do not load"

Closes #311

See merge request !417

Bump version to 4.0.0.dev6

See merge request !416

Reformat

See merge request !415

Translations update from Weblate

See merge request !410

Currently translated at 100.0% (84 of 84 strings)

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

Currently translated at 98.8% (83 of 84 strings)

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

Translations update from Weblate

See merge request !412

Currently translated at 99.6% (318 of 319 strings)

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

Currently translated at 87.4% (279 of 319 strings)

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

Update translation files

See merge request !414

Resolve "Parent menu point does not check for any permissions"

Closes #312

See merge request !411