Resolve "Add page "Missing entries""

Closes #156

See merge request !183

Optimize ORM workload for week view by avoiding/minimizing prefetch operations

See merge request !173

Resolve "[My students] Students lists aren't sorted alphabetically"

Closes #154

See merge request !181

Fix migrations (replace JSON field etc.)

See merge request !186

Update poetry.lock

See merge request !187

Fix queries for dates with generate_list_of_all_register_objects

See merge request !185

Merge branch '158-back-button-in-lesson-view-should-redirect-to-the-person-s-week-view' into 'master'

Resolve "Back button in lesson view should redirect to the person's week view"

Closes #158

See merge request !180

Use render_pdf to generate full register printout

See merge request !179

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

Resolve "Lesson topic not carried to previous lesson if entered in second lesson of a block"

Closes #139

See merge request !169

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