newforms-admin: Fixed #5661. Added a missing import.

git-svn-id: http://code.djangoproject.com/svn/django/branches/newforms-admin@7225 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/contrib/admin/util.py

@@ -4,6 +4,7 @@ from django.utils.html import escape
 from django.utils.safestring import mark_safe
 from django.utils.text import capfirst
 from django.utils.encoding import force_unicode
+from django.utils.translation import ugettext as _
 
 def _nest_help(obj, depth, val):
     current = obj