Fixed #15938 -- Prevented the `max_length` number in the admin `prepopulated_fields` javascript to be localized when `USE_THOUSAND_SEPARATOR` is turned on. Thanks to Lev Maximov, Mathieu Agopian and feel.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@17033 bcc190cf-cafb-0310-a4f2-bffc1f526a37