[1.2.X] Fixed #14164 -- Ensure that sitemap priorities aren't rendered with...

[1.2.X] Fixed #14164 -- Ensure that sitemap priorities aren't rendered with localized numerical formats. Thanks to dokterbob for the report, and vung for the draft patch.

Backport of r13644 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@13646 bcc190cf-cafb-0310-a4f2-bffc1f526a37