[1.5.x] Changed testing strategy used in 6b03179e.

Avoid polluting the app cache as it causes unrelated test failures.

Refs #19688.

Backport of 7b49da1 from master.
[1.5.x] Minor edits to some recently-added admin docs.

Backport of 8f839aaa180f from master.
[1.5.x] Fixed #19903 -- Fixed unbalanced setUp/tearDown calls in LiveServerAddress test

Backport of 6d52bcbb7c from master.
[1.5.x] Updated translations
[1.5.x] Fixed #18144 -- Restored compatibility with SHA1 hashes with empty salt.

Thanks dahool for the report and initial version of the patch.

Backport of 633d8de from master.
[1.5.x] Fixed #6195 -- Documented caching options for javascript_catalog.

Backport of 0836670 from master
[1.5.x] Fixed #19634 -- Added proper __hash__ methods.

Classes overriding __eq__ need a __hash__ such that equal objects have
the same hash.

Thanks akaariai for the report and regebro for the patch.

Backport of e76147a from master.
[1.5.x] Bump version numbers for Django 1.5 release.
[1.5.x] Add release date to 1.5 release notes.
[1.5.x] Update trove classifier for 1.5 final release.
[1.5.x] Correct final element of version tuple.
[1.5.x] Fixed #19922 - Typo in translation docs.

Thanks amoebob for the report.

Backport of 9ce1b6191b from master
[py3] Always fed hashlib with bytes.
[1.5.x] Fixed #16807 - Added a class-based views intro.

Thanks Preston Holmes for the text.

Backport of 2108941677 from master
[1.5.x] Fixed #19926 -- Fixed a link to code example in queries docs

Thanks Randy Salvo for the report.
Backport of b0ba21db07 from master.
[1.5.x] [py3] str.decode does not exist; str.encode was intended

Backport of fba6df19b5 from master
[1.5.x] Fixed #19937 - Typo in class-based views intro.

Backport of d009ffe436 from master
[1.5.x] Fixed #19960 -- Fixed sentence in contrib.auth signals docs

Thanks edd at slipszenko.net for the report.
Backport of 6d3b0c33dc from master.
[1.5.x] Fixed #19962 - Added a note about SESSION_EXPIRE_AT_BROWSER_CLOSE and browsers that persist sessions.

Thanks David Sanders.

Backport of fe5d9fe5fe from master
[1.5.x] Fixed #19933 -- Catched ValueError in get_system_username

Thanks lanre.hbs at gmail.com for the report.