[1.6.x] Fixed #21337 -- Documented removal of django.core.servers.basehttp.WSGIServerException

refs 2ca00faa913754cd5860f6e1f23c8da2529c691a

Backport of b47a052eb5 from master
[1.6.x] Fixed #21316 -- Documented that modifying safe strings makes them unsafe.

Thanks dev@simon.net.nz for the suggestion and vijay_shanker for the patch.

Backport of 1edef50880 from master
[1.6.x] Documented the limitation on sep argument to Signer

Co-Authored-By: Gavin Wahl <gwahl@fusionbox.com>

Backport of e9a356a695 from master
[1.6.x] Fixed #21294 -- Clarified the logout next_page argument.

Thanks wim at go2people.nl for the report.

Backport of 51e6575472 from master
[1.6.x] Fixed #21306 -- Documented lower-casing behavior of title filter.

Backport of eafe279120 from master
[1.6.x] Fixed #21347 -- Added missing JS variable declaration.

Thanks szymon.barglowski at gmail.com for the report.

Backport of 0b1d425a41 from master
[1.6.x] Fixed #21339 -- Documented removal of some form field error messages
[1.6.x] Fixed #21359 -- Corrected MySQL collation name in databases docs

Thanks k_sze for the report.
Backport of 67c6c1a7c from master.
[1.6.x] Fixed #21364 -- Specified InnoDB full-text support from MySQL 5.6.4 on

Thanks thevlad at gmail.com for the report.
Backport of 89116cf24a from master.
[1.6.x] Fixed typo -- "a" user, not "an" user

Backport of c7dabe49dd from master
[1.6.x] Fixed spelling ("dependant" -> "dependent")

Dependent means reliant on.
A dependant is a person like a child or spouse.

Thanks Andrew Wilcox for the report.

Backport of 090315f5df from master
[1.6.x] Fixed #21373 -- Typo fixed in i18n docs

Thanks rpq at winscores.com for the report.
Backport of 88b9d4ff3a from master.
[1.6.x] Pulled Transifex translations for Django core
[1.6.x] Pulled Transifex translations for contrib apps