* Fix: Use `line.fields|length` in fieldset.html and change GET to POST in test_invalidated_user_logout

* Fix: Change `pytest.mark.optionalhook` to `pytest.hookimpl(optionalhook=True)`

* Fix: Django deprecations (DEFAULT_FILE_STORAGE, index_together)

* Bump django-compressor from `>=4.3,<4.4` to `>=4.5,<4.6`

* Bump django-mptt from `>=0.14,<0.15` to `>=0.16,<0.17` and update postgres to 14.17

* Fix: `Model instances passed to related filters must be saved` error in models.py

* Fix: Remove `filter_horizontal` in BaseTagAdmin and bump django to 5.1.7

* Fix: Django deprecation (log_deletion, log_actions)

* Fix: test_can_change_login_from_invalid and test_login_cannot_change_from_valid

* Ordering of DifficultyTags (sio2project#449)

* Add ordering for DifficultyTag and DiffultyTagLocalization

* Make migrations

* Update migrations

* Fix: Add  `unlocalize` to progress percentage in task-archive-problemgroup.html

* Refactor: Remove redundant `USE_L10N` in default_settings.py (due django deprecation)

* Add a note about copying limits (sio2project#480)

* Add a note about copying limits

* Add text translation

* Github Actions - Downloaded translations. (sio2project#495)

Co-authored-by: SIO2 Automatic Agent <[email protected]>

* add buttons to expand group member lists (sio2project#493)

* Fix: Move `DATETIME_FORMAT` to custom format files

* Fix: `TypeError: cannot pickle 'generator' object` error

* Fix: Replace LogoutView with logout() in `not_anonymous` function

* Fix: TestsSelectionForm

* Fix: Add `request` lookup_allowed() (django deprecation)

* Fix: Add missing migrations (due to index_together deprecation)

* Searchbox bugfix (sio2project#489)

* Now if tags don't show up in probset, only superusers can filter by them.

* Fix bug allowing for duplicate difficulty search tags.

* Fix bug in filtering by difficulty tags.

* PARTIAL fix to tests in TestProblemSearchHintsTags.

* Hide tags under searchbox and tag search hints when PROBLEM_TAGS_VISIBLE = False (even for admin).

* Fix more tag hint tests.

* Fix all but one test from TestProblemSearch.

* Remove temporary comment.

* Override setting globally for TestProblemSearchHintsTags.

* Override settings globally for TestProblemSearchOrigin.

* Add setting override to test_statistics_sorting_with_query.

* Fix column number in test_statistics_sorting_with_query.

* Fix the column number being ordered by in test_problem_statistics.py.

* Better problem column array naming in TestProblemStatisticsDisplay.

* Rename problem 'Znacznik' in test_problem_search.json to 'Znacznik_zadanie', as 'Tags' are localised in Polish to 'Znaczniki' which caused false positives when checking if the task appeared in URL.

* Rename 'Znacznik_zadanie' to 'Znaczn1k', as its previous name still caused name collisions.

* fix minor bugs in usergroups app and add tests (sio2project#498)

* first commit

* fix permissions

* fix admin panel not saving

* small fixes

* fix origin info

* change permission name

* fix permissions for contest admins

* fix permissions for contest admins

* fix for problems without contests

* add test

* resolve conflicts

* small fix

* test tags tab

* squash migrations

* remove redundant migrations

* display nickname next to the full name when displaying contest pupils

* add logic and use member.username

* fix more similar cases

* fix order of names

* more elegant code

* more elegant code

* revert changes

* more elegant code

* add buttons to expand group member lists

* fix minor bugs

* add tests

* Fix: Migrations due `index_together` deprecation

* Bump django from `5.1.7` to `o>=5.2,<5.3`

* Refactor: Use admin decorators and replace `re_path` with `path` (assisted by `django-upgrade` tool)

* Refactor: Remove redundant comment from setup.py

* Docs: Adapt to Django 5.2

* Bump the minimum version of `pytest-django` to `4.11`, and update `django-nested-admin` to `>=4.1,<4.2`

---------

Co-authored-by: Iteron-dev <[email protected]>
Co-authored-by: reivvax <[email protected]>
Co-authored-by: Kamil Szymczak <[email protected]>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: SIO2 Automatic Agent <[email protected]>
Co-authored-by: Atanazy Gawrysiak <[email protected]>
Co-authored-by: Grzegorz Franciszek Krawczyk <[email protected]>