Merge pull request #511 from ryankask/username-password-admin

Allowed custom User models to use the UserAdmin's change password view.

Fix #19056 (again).

django/contrib/auth/admin.py

@@ -133,7 +133,7 @@ def user_change_password(self, request, id, form_url=''):
         adminForm = admin.helpers.AdminForm(form, fieldsets, {})
 
         context = {
-            'title': _('Change password: %s') % escape(user.username),
+            'title': _('Change password: %s') % escape(user.get_username()),
             'adminForm': adminForm,
             'form_url': form_url,
             'form': form,