Merge branch 'master' into 139-lesson-topic-not-carried-to-previous-lesson-if-entered-in-second-lesson-of-a-block

Denote Teckids e.V. as licensor as defined by EUPL

See merge request !178

This is important to clarify the jurisdiction and court location in case of
license disputes.

Prepare django 3.2 update

See merge request !177

Fix migration

See merge request !176

Update copyright information for 2021

See merge request !174

Update poetry.lock

See merge request !175

Merge branch 'master' into 139-lesson-topic-not-carried-to-previous-lesson-if-entered-in-second-lesson-of-a-block

Fix GlobalPermissionModel

See merge request !172

Avoid superfluous query for previous lesson in lesson.html

See merge request !171

Simplify getting of teacher names in _generate_dicts_for_lesson_periods

See merge request !170

It has been already fetched in the view.

Use only get_teachers in full register printout

See merge request !168

get_teachers will automatically select the correct teachers
without any need for further action

Resolve "Full register shows all persons of school (but without statistics)"

Closes #153

See merge request !167

Optimize object permission queries by using django-guardian's prefetch util

See merge request !165

Merge branch '151-get_or_create-for-lesson-documentations-and-personal-notes-doesn-t-work-correctly-because-of' into 'master'

Resolve "get_or_create for lesson documentations and personal notes doesn't work correctly because of missing unique index"

Closes #151

See merge request !166

Resolve "[SQL] Query for person statistics in week overview takes very long"

Closes #149

See merge request !164

Translations update from Weblate

See merge request !160

Jonathan Weth authored 4 years ago and Jonathan Weth committed 4 years ago

Currently translated at 100.0% (250 of 250 strings)

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

Resolve "[SQL] Person statistics in "My students" take very long"

Closes #150

See merge request !162

- Move filter conditions into JOIN clause
- Remove superflouos subquery for tardiness
- Remove unnecessary JOINs
  - Remove need for DISTINCT by fixing double JOIN on personal notes

Currently translated at 100.0% (250 of 250 strings)

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

Update translation files

See merge request !161