Update changelog from 2.0rc2

See merge request !210

(cherry picked from commit b9f2a338)

Merge branch '170-my-overview-and-all-lessons-don-t-work-if-there-is-no-current-school-term' into 'master'

Resolve "My overview and All Lessons don't work if there is no current school term"

Closes #170

See merge request !207

Merge branch 'master' into 170-my-overview-and-all-lessons-don-t-work-if-there-is-no-current-school-term

Update changelog from 2.0rc1

See merge request !208

Update versions and update poetry.lock

See merge request !206

(cherry picked from commit f8f23830)

Resolve "Use correct semantic html elements"

Closes #168

See merge request !203

Update translation files

See merge request !201

Resolve ""Lesson documentation" tab missing in 'My overview' for teachers"

Closes #166

See merge request !202

Resolve "Preference section is German"

Closes #167

See merge request !200

Update maintainers and Trove categorisation

See merge request !198

Set version and core dependency to 2.0b0

See merge request !196

Resolve "Fields must be unique per site"

Closes #163

See merge request !197

Resolve "Update feature list"

Closes #164

See merge request !194

Resolve "Fix rules/permissions"

Closes #165

See merge request !195

Update changelog for 2.0b0

See merge request !192

Translations update from Weblate

See merge request !193

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 "Rename rules to allow differentiation from permissions"

Closes #161

See merge request !190

Resolve "Sync Copyright in README.md and apps.py"

Closes #162

See merge request !191