Merge remote-tracking branch 'origin/831-data-management-for-the-model-room' into 831-data-management-for-the-model-room

Merge branch '831-data-management-for-the-model-room' of edugit.org:AlekSIS/official/AlekSIS-Core into 831-data-management-for-the-model-room

Resolve "Regional tel format isn't accepted"

See merge request !1189

# Conflicts:
#   CHANGELOG.rst

Merge branch '814-changing-maintenance-mode-state-spawns-mini-aleksis-inside-aleksis' into 'release-3.0'

Resolve "Changing Maintenance Mode State spawns "Mini-AlekSIS" inside AlekSIS"

See merge request !1216

Merge branch '835-notifaction-send-always-creates-celery-task-with-force-sending' into 'release-3.0'

Resolve "Notifaction.send always creates Celery task with force sending"

See merge request !1212

Merge branch 'release-3.0' into '835-notifaction-send-always-creates-celery-task-with-force-sending'

# Conflicts:
#   CHANGELOG.rst

Resolve ""Retry" button opens about:blank in new tab"

See merge request !1220

# Conflicts:
#   CHANGELOG.rst

Merge branch '846-query-strings-do-not-get-passed-when-navigating-legacy-pages-in-spa' into 'release-3.0'

Resolve "Query strings do not get passed when navigating legacy pages in SPA"

See merge request !1222

Resolve "Fix cachalot issues (aka upgrade cachalot)"

See merge request !1221