reverse_lazy is now provided by Django itself

mayan/settings.py

@@ -2,10 +2,7 @@
 import os
 import sys
 
-from django.core.urlresolvers import reverse
+from django.core.urlresolvers import reverse_lazy
-from django.utils.functional import lazy
-
-reverse_lazy = lazy(reverse, str)
 
 ugettext = lambda s: s