The same thing was discussed above (around comment 5).
The message is generated by Django (not by horizon), so this bug should be forwarded to Django (if it still exists in the latest version of Django like 1.11).
The same thing was discussed above (around comment 5).
The message is generated by Django (not by horizon), so this bug should be forwarded to Django (if it still exists in the latest version of Django like 1.11).