Fix d'un oubli d'import

re2o/views.py

@@ -27,6 +27,7 @@ les views
 from __future__ import unicode_literals
 
 from django.http import Http404
+from django.urls import reverse
 from django.shortcuts import render, redirect
 from django.template.context_processors import csrf
 from django.contrib.auth.decorators import login_required, permission_required