Fixed incorrect docstring in cache tests
Fixed three small flake8 violations.
Fixed #7571 -- Fixed parameter matching in include()'d urlpattern

Fixed URL resolving in the case where an outer regex includes an inner
regex and both regexes use positional parameters instead of named
groups, causing the outer regex's parameters to override the inner
regex's.

Modified the regex url resolver so that it will concatenates and then
normalizes, instead of normalizing and then concatenating.
Fixed incorrect docstring in cache tests (take two)

3e25c8ac69ae336102d91f1d2591ab03f3a91e33 was an incomplete
merge of the pull request.

Thanks to @ramast for catching this.
Really hidden warnings in javascript_quote tests

Refs #21725.
Fixed #22206 -- Passed models.TextField.max_length to forms.CharField.maxlength
Fixed #14549 - Removed restriction of single FKs on intermediary tables

Thanks to Loic Bistuer for review. Minor changes to error messages
done by committer.
Fixed #22207 -- Added support for GenericRelation reverse lookups

GenericRelation now supports an optional related_query_name argument.
Setting related_query_name adds a relation from the related object back to
the content type for filtering, ordering and other query operations.

Thanks to Loic Bistuer for spotting a couple of important issues in
his review.
Fixed issues and added new scripts to urlify.js

Added the following scripts:
* Lithuanian (thanks to petraszd for the patch)
* Serbian (thanks to offy)
* Azerbajani (thanks to Ali Ismayilov)

Fixed the following issues:
* In Polish character map, some uppercase letters were
  converted to a lowercase ascii equivalent.
* The letter Y with a diaeresis had a lowercase version but no uppercase.

The code was also simplified and cleaned up:
* Use of `var` statements everywhere
* Systematic use of semicolons
* Proper looping over arrays and objects.

Thanks to @oinopion for his help in getting the javascript
into proper shape.

Fixes #8561, #11035.