For example, this avoids a warning in the case of a request that's
redirected to a language-prefixed URL by LocaleMiddleware.

Fixed #26281 -- Added a helpful error message for an invalid format specifier to dateformat.format().

The latest version (16.1) is backwards-incompatible for Django.

Thanks NotSqrt for the excellent report and Tim Graham for the review.

Thanks adamchainz for the report and review.

Thanks Sergey Fedoseev for the report.

Thanks Fabien Schwob for the initial patch.

Thanks Tim Graham for the review.

 - Update installer option for PATH installation
 - Add link directly to pip install docu, ref get-pip.py
 - Add note about installing Django to the virtualenv that was setup in the previous step

Unused since ae7cb577.

Thanks Cristiano Coelho and Tim Graham for the reviews.

Unused since f212b24b.