Add template for pull requests at GitHub for mirroring

See merge request !472

Resolve "Add possibility to upload files via CKEditor"

Closes #364

See merge request !470

Resolve "Provide landscape print template"

Closes #311

See merge request !469

Update poetry.lock

See merge request !466

Merge branch '333-add-possibility-to-manage-object-level-permissions-for-group-and-person-models-in-admin' into 'master'

Resolve "Add possibility to manage object-level permissions for Group and Person models in admin interface"

Closes #333

See merge request !418

Include support for icons in Materialize chips template

See merge request !462

Resolve "CSS arrows for django-tables2 materialize"

Closes #358

See merge request !465

Make help text in Materialize forms smaller

See merge request !463

Resolve "Add own menu entry for notifications"

Closes #327

See merge request !447

Bugfix/do not link person if anonymous

See merge request !461

Always return False for `has_person` if not logged in

See merge request !460

Revert "Support custom authentication backends"

Closes #313

See merge request !459

Enable all panels in djdt

See merge request !458

Resolve "Allow automatic linking of persons to account by e-mail address"

Closes #332

See merge request !414

Update tox.ini; compile messages before building dist

See merge request !457

Support `to_python` on fake proxy field

See merge request !456