[1.2.X] Fixed #12650 -- Don't generate invalid XHTML in the admin, databrowse apps when

the i18n context processor is active. Thanks to Rob Hudson for the report and
fix suggestion.

Backport of [14104] from trunk

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@14105 bcc190cf-cafb-0310-a4f2-bffc1f526a37