Resolve "Add impersonate button to person view"

Closes #300

See merge request AlekSIS/official/AlekSIS!354

Update dependency pytest to v6

See merge request AlekSIS/official/AlekSIS!350

Update dependency django-otp to v1

See merge request AlekSIS/official/AlekSIS!352

Seperate pages from deploy to demo-master

See merge request AlekSIS/official/AlekSIS!335

Update dependency flake8-isort to v4

See merge request AlekSIS/official/AlekSIS!349

Enable PostgreSQL connection pooling

See merge request AlekSIS/official/AlekSIS!345

Update dependency django-otp to v0.9.4

See merge request AlekSIS/official/AlekSIS!346

Fix DoesNotExist exception in has_any_object

See merge request AlekSIS/official/AlekSIS!347

Show celery tasks on system status again

See merge request AlekSIS/official/AlekSIS!348

Resolve "Add helper function to filter a queryset by a rule"

Closes #293

See merge request AlekSIS/official/AlekSIS!318

Fix backup options

See merge request AlekSIS/official/AlekSIS!343

Fix translation source

See merge request AlekSIS/official/AlekSIS!344

# Conflicts:
#	aleksis/core/tasks.py

Fix add_class_to_el templatetag to work with lists for classes

See merge request AlekSIS/official/AlekSIS!342

Include email extension in makemessages called by dev.sh

See merge request AlekSIS/official/AlekSIS!340

Delay sending of notification until it's saved in database

See merge request AlekSIS/official/AlekSIS!341

Currently translated at 99.7% (362 of 363 strings)

Translation: AlekSIS/AlekSIS
Translate-URL: https://translate.edugit.org/projects/aleksis/aleksis/de/

Currently translated at 99.7% (362 of 363 strings)

Translation: AlekSIS/AlekSIS
Translate-URL: https://translate.edugit.org/projects/aleksis/aleksis/de/