Fixed #16659 -- Made the admin's date drilldown links in the changelist have a...

Fixed #16659 -- Made the admin's date drilldown links in the changelist have a variable width to play nicer with languages with long month names.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@16854 bcc190cf-cafb-0310-a4f2-bffc1f526a37