django/django — pull request #791 by khalas (2013-02-23 18:10:26+00:00)
Title: Changed %r to %s in get_language_info error message

Python 3 compatibility. Look here https://github.com/django/django/commit/6bd6a568960e9ddebd78da8e008b235b3b76c5a2#commitcomment-2680512