Switch from mimetype to content_type when initializing HttpResponse objects
Switch from mimetype to content_type when initializing HttpResponse objects

Refs Django issue #16519.

matthiask/feincms2-content,nickburlett/feincms,matthiask/django-content-editor,feincms/feincms,michaelkuty/feincms,matthiask/django-content-editor,michaelkuty/feincms,matthiask/django-content-editor,michaelkuty/feincms,mjl/feincms,joshuajonah/feincms,nickburlett/feincms,matthiask/django-content-editor,feincms/feincms,matthiask/feincms2-content,mjl/feincms,feincms/feincms,joshuajonah/feincms,joshuajonah/feincms,michaelkuty/feincms,nickburlett/feincms,mjl/feincms,joshuajonah/feincms,matthiask/feincms2-content,nickburlett/feincms