Fixed #19663 -- Allowed None in colorize() text parameter

Thanks Jonathan Liuti for the report and the initial patch, and
Simon Charette for the review.
Merge pull request #682 from LucianU/master

Fixed #19690 - Removed unused import in doc examples
Fixed content types contrib app doc typos.
Small generic FK docs tweaks.
Added test to demonstrate issue 11263 isn't there anymore.

Thanks veena for the report and jaklaassen for the patch. Fixes #11263.
Added test to demonstrate issue 11387 isn't there anymore.

Thanks adurdin for the report and patch. Fixes #11387.
Fixed the test introduced in 2ca37af6 under Python 3.
Made ungettext_lazy usable for messages that do not contain the count.

Fixed #19160 (again). Thanks Alexey Boriskin.
Fixed #18144 -- Added backwards compatibility with old unsalted MD5 passwords

Thanks apreobrazhensky at gmail.com for the report.
Added missing parentheses in if clause
Lowered field ordering requirement in ogrinspect test

This test was randomly failing depending on the library environment.
Fixed #19700 - Added documentation for BoundField.field.

Thanks Tiberiu Ana for the report and patch.
Fixed #19445 -- Skip admin fieldsets validation when the ModelAdmin.get_form() method is overridden.
Fixed #19333 -- Moved compress.py outside of the admin static folder. Thanks to camilonova, Russell Keith-Magee, Aymeric Augustin and Ramiro Morales for the feedback.
Fixed #14305 -- Switched inspectdb to create unmanaged models.

Thanks Ian Kelly for the report and initial patch.
Fixed #17797 -- Enabled support for PATCH requests in the dummy test client. Thanks to pfarmer for the suggestion and initial patch.
Fixed Python 3.2 compatibility for a test.
Fixed #19645 -- Added tests for TransactionMiddleware
Fixed a typo in docs/topics/auth/customizing.txt
Fixed #19730 -- Don't validate importability of settings by using i18n in management commands.

They are handled independently now and the latter can be influenced by
the new BaseCommand.leave_locale_alone internal option.

Thanks chrischambers for the report, Claude, lpiatek, neaf and gabooo for
their work on a patch, originally on refs. #17379.