Fixed #21603 (again) -- Made a raw query in a test Oracle-compliant
Fixed #18767 -- Fixed admin calendar for other locales than English.

Refactored openCalendar function from DateTimeShortcuts.js. Now, when
entered manually in the input field, the date will show up correctly on
the calendar for locales that don't use "-" for separator.

Thanks charettes for revivew and Alexey Boriskin for some of the patch.
Removed doc reference to removed HttpResponse.mimetype.
Corrected content_type parameter name in sitemap docs.

mimetype was deprecated in 1.5 per 11ec0253ab4cc926ab9e77619132cb398231ac33.
Fixed test failure on python 3.x.
Fixed #23270 -- Added selected reverse relations to the only fields