Resolve "_adjacent_lesson doesn't respect persons without lessons"

Closes #107

See merge request !126

Fix view of regular plans

See merge request !125

Update tox.ini; compile messages before building dist

See merge request !124

Bump version to next development cycle

See merge request !123

Release 2.0a3

See merge request !122

Fix testsuite

See merge request !121

Update tox.ini. Advances AlekSIS-Core#338

See merge request !120

Update tox.ini. Advances AlekSIS-Core#338

See merge request !119

Show full timetable on my timetable on desktop

Closes #77

See merge request !117

Update poetry.lock

See merge request !118

Resolve "Add never_cache decorators"

Closes #104

See merge request !116

Resolve "Make previous/next lesson buttons independent of validity range"

Closes #105

See merge request !114

Currently translated at 100.0% (122 of 122 strings)

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

Fix issues according to absences admin

See merge request !108

Resolve "Show only the parent groups in 'Affected groups'"

Closes #95

See merge request !111

Merge branch '100-sort-the-list-by-parent-groups-if-displaying-parent-groups-is-activated' into 'master'

Resolve "Sort the list by parent groups if displaying parent groups is activated"

Closes #100

See merge request !110

Resolve "Sort teacher abbreviations alphabetically"

Closes #103

See merge request !109

Fix missing returns and assignments in relation to supervision querysets

See merge request !107

Update lockfile

See merge request !106