Django-tables2

- Add Persian (Farsi) locale ([806](https://github.com/jieter/django-tables2/pull/806)) by [Alirezaja1384](https://github.com/jieter/django-tables2/commits?author=Alirezaja1384)
- Improved error message if openpyxl is not installed ([816](https://github.com/jieter/django-tables2/pull/816))
- Use correct mime type for xlsx (fixes: [810](https://github.com/jieter/django-tables2/issues/810))
- Add support for django 4.0, drop support for python 3.5 ([822](https://github.com/jieter/django-tables2/issues/822))

- Add support for django 3.2 and python 3.9, drop support for django 3.0
- Add Django 3.0 and 3.1 trove classifiers [803](https://github.com/jieter/django-tables2/pull/803) by [Asday](https://github.com/Asday)
- Strip leading and trailing whitespace from TemplateColumn.value() [794](https://github.com/jieter/django-tables2/pull/794) by [jeremystretch](https://github.com/jeremystretch)
- Providing link for django-bootstrap3 [793](https://github.com/jieter/django-tables2/pull/793) by [TareqMonwer](https://github.com/TareqMonwer)
- Fix for crash on windows while deleting temp file [788](https://github.com/jieter/django-tables2/pull/788)

- Removed deprecation warnings with django==3.1 regarding `JSONField` [785](https://github.com/jieter/django-tables2/pull/785)

- Use `table.default` for empty `ManyToMany` relations ([773](https://github.com/jieter/django-tables2/pull/773)) fixes: [#769](https://github.com/jieter/django-tables2/issues/769)
- Pass record/value to `CheckboxColumn`'s `attrs` callables too ([774](https://github.com/jieter/django-tables2/pull/774)), fixes: [#762](https://github.com/jieter/django-tables2/issues/762)

- Fix popping the extra_context of TemplateColumn [767](https://github.com/jieter/django-tables2/pull/767) by [bernhardmiller](https://github.com/bernhardmiller)
- Fix typo for the translation of the word 'next' in greek [759]](https://github.com/jieter/django-tables2/pull/759) by [orfeasa](https://github.com/orfeasa)
- Add `format_html` import to prevent `NameError` [752](https://github.com/jieter/django-tables2/pull/752) by [MBfromOK](https://github.com/MBfromOK)
- Fixed Russian translation [768](https://github.com/jieter/django-tables2/pull/768) by [Real-Gecko](https://github.com/Real-Gecko)

- Fixed the `LazyPaginator` in a simpler more predictable way: an attempt to show a non-existent page, shows the first page. [743](https://github.com/jieter/django-tables2/pull/743)