This adds a custom template for the delete confirmation page used in the

admin UI for models. Django's default template doesn't render quite

well, and doesn't offer any flexibility for customization. Our version

is a bit friendlier and fits our modern style in the admin UI.
This covers the main confirmation page, the "protected objects"

confirmation page (used if a ForeignKey is set to prevent deletion of

the referenced object using the PROTECT flag), or if the user doesn't

have permission for one or more objects.

Tested the standard deletion page, the permission errors page, and the

protected relations page.
Tested all the buttons on all pages.