it's a small fix: when there was an error in the signup form, the redirection to signup was without allow_signup, wich triggered a weird "you can't singup" message.

app/authentification/views.py

@@ -46,4 +46,4 @@ class SignupView(TemplateView):
             email.send()
             return render(request, 'validate_mail_address_complete.html')
         else:
-            return render(request, self.template_name, {'form': form})
+            return render(request, self.template_name, {'form': form, 'allow_signup': bool(settings.ALLOW_SIGNUP)})