Fixed documentation of disable_constraint_checking

The docstring and base implementation of disable_constraint_checking do not indicate that a return value is expected for proper behavior.
Fixed #18336 -- Doubled request_queue_size.

This reduces random failures to load static files with Google Chrome.
Pointed to the docs version switcher in tutorial 1.

Refs #20324. Thanks dwisehart for the suggestion.
Fixed #18986 -- Improved error message for missing files

in CachedStaticFilesStorage. Thanks zyegfryed for his work on the patch.
Tested that get_or_create raises IntegrityError.

It used to raise "DatabaseError: no such savepoint" with the old
transaction management. Closes #15117.
Corrected "it's" to "its" when used possessively.

Fixed #20327.
Fixed #20330 -- Normalized spelling of "web server".

Thanks Baptiste Mispelon for the report.
Fix two typos in database transactions docs
Merge pull request #1034 from infraredgirl/master

Fix two typos in database transactions docs
Fixed #20336 -- Removed obsolete paragraph from the docs.

Thanks Baptiste Mispelon.
Fixed #19252 -- Added support for wheel packages.

Signed-off-by: Jannis Leidel <jannis@leidel.info>
Fixed test failures introduced in a5becad9094e5c5403b692b9a7b3a6ffaabf64a3.
Fixed #20338 - Document FQDN behavior with ALLOWED_HOSTS
Updated translation templates and removed en translations

"en" translations have been mistakenly committed in 87cc3da81.
Added myself to the committers list.
Added clarification to the docs, pointing out that unique_for_date only considers the date portion of DateTime fields.
Used ngettext in a formsets error message

Several languages will distinctly translate '%d or fewer forms'
depending on the variable.
Systematically imported wraps from functools
Fixed #18351 -- Added X-Robots-Tag header to sitemaps

Thanks Michael Lissner for the report and initial patch, and
Tom Mortimer-Jones for working on the patch.
One more changed import location of wraps