Fixed #7831: be case-insensitive when in `get_language_from_request`.
Fixed #7831: be case-insensitive when in `get_language_from_request`.


git-svn-id: 554f83ef17aa7291f84efa897c1acfc5d0035373@8561 bcc190cf-cafb-0310-a4f2-bffc1f526a37

svn2github/django,svn2github/django,svn2github/django