[1.5.x] Fixed #19092 -- Completed Lithuanian date/time formats

Thanks Tadas Dailyda for the report and the patch.
Backport of 2f8ab2f1b0 from master.
[1.5.x] Fixed #19605 - Removed unused url imports from doc examples.

Thanks sergzach for the suggestion.

Backport of 43f89e0ad6 from master
[1.5.x] Clarified WizardView.get_form_prefix doc, refs #19024

Backport of c9b577ead6 from master
[1.5.x] Fixed #19614 -- Missing request argument in render call.

Thanks Dima Pravdin for the report.

Backport of 74d72e2.
[1.5.x] Fixed a typo in the error reporting docs.

Backport of 83d0cc52.
Updated core translations
Updated localflavor translations
Updated contrib apps translations
[1.5.x] Fixed #19597 - Added some notes on jQuery in admin.

Thanks Daniele Procida.

Backport of d406afe12e from master
Fixed i18n test to match changed translation
[1.5.x] Fixed #19632 -- Bug in code sample.

Thanks grossmanandy at bfusa com and Simon Charette.

Backport of 1dd7492.
[1.5.x] Fixed #19628 - Noted that app for custom user model must be in INSTALLED_APPS

Thanks dpravdin and Jordan Messina.

Backport of 0375244eae from master
[1.5.x] Fixed #19606 -- Adjusted cx_Oracle unicode detection.

Backpatch of d194f290571f7e9dda7d2fd7a6f2b171120f2f14
[1.5.X] Fixed #19596 -- Use `_default_manager` instead of `objects` in the auth app.

This is needed to support custom user models which don't define a manager
named `objects`.

Backport of cc4de61a2b36abf418d6f4c720d9e62c405e0612 from master.
[1.5.x] Fixed #19640 - Added inlineformset_factory to reference docs.

Thanks wim@ for the suggestion.

Backport of 5b2d9bacd2 from master
[1.5.x] Fixed #19477 - Documented generic_inlineformset_factory

Thanks epicserve for the suggestion.

Backport of 214fb700b9 from master
[1.5.x] Fixed #19633 - Discouraged use of gunicorn's Django integration.

Backport of 0db86273ae from master
[1.5.x] Fixed #19652 -- Fixed .none() regression in related fields

The regression was caused by using .none() when querying for related
models, and the origin field's value was None. This resulted in missing
custom related manager subclass as .none() returns plain QuerySet.

This isn't backport from master, in master .none() correctly preserves
the queryset's class.

Patch provided by Simon Charette, with some minor polish by committer.
[1.5.x] Fixed #19610 - Added enctype note to forms topics doc.

Thanks will@ for the suggestion.

Backport of 0de2645c00 from master
[1.5.x] Fixed typo.

Backport of 71c8539570 from master