tests do not change language back after fail, changing template loaders to default before testing

[andrey@…]

Currently if django management command have error, it calls sys.exit() and after that changes language to previous.

If I run command it is ok – no code executes after sys.exit, but ChangepasswordManagementCommandTestCase catches SystemExit exception and continues execution. And all tests after it have incorrect settings. Solution is to use finally to fix this code.

Also it is possible now to use jinja2 template loaders, which is not compatible with django. django.contrib.auth tests use django templates and application's default template loader. Some tests dies.

Attached patch revers language even if system.exit called and uses django's default template loaders for tests

[andrey@…]

patch

[Claude Paroz]

Please don't mix issues in a single tickets. Create separate tickets for each different issue.

[Claude Paroz]

Closing as it has been split into #17947 and #17948.