[1.0.X] Fixed #10369 -- Fixed auto-escaping inside "tran" and "blocktrans" tags.

Patch from Andrew Badr.

Backport of r10519 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@10520 bcc190cf-cafb-0310-a4f2-bffc1f526a37