Resolve "Use Select2 everywhere"

Closes #102

See merge request AlekSIS/official/AlekSIS!362

Revert "Merge branch 'add-landscape-print-template' into 'master'"

See merge request AlekSIS/official/AlekSIS!377

This reverts merge request !339

Add landscape print template. Closes #311

Closes #311

See merge request AlekSIS/official/AlekSIS!339

Merge branch '102-use-select2-everywhere' of https://edugit.org/AlekSIS/AlekSIS into 102-use-select2-everywhere

Resolve "django.contrib.postgres.fields.JSONField is deprecated"

Closes #306

See merge request AlekSIS/official/AlekSIS!373

Resolve "Creating translation files fails because circular import"

Closes #296

See merge request AlekSIS/official/AlekSIS!374

Replace datetime.now() by timezone.now()

Closes #190

See merge request AlekSIS/official/AlekSIS!375

Fix import

See merge request AlekSIS/official/AlekSIS!370

Add cached content type getter

See merge request AlekSIS/official/AlekSIS!368

Merge branch '303-use-default-values-in-date-inputs-as-preselected-value-for-datepickers' into 'master'

Resolve "Use default values in date inputs as preselected value for datepickers"

Closes #303

See merge request AlekSIS/official/AlekSIS!369

Also move initialization of date and time pickers to own functions

Update submodules

See merge request AlekSIS/official/AlekSIS!367

Fix admin docs

See merge request AlekSIS/official/AlekSIS!365

Update dependency dynaconf to v3

See merge request AlekSIS/official/AlekSIS!323

Update dependency django-maintenance-mode to ^0.15.0

See merge request AlekSIS/official/AlekSIS!358

Update dependency django-polymorphic to v3

See merge request AlekSIS/official/AlekSIS!355