Warn users trying to use a personalised template

Since contact lists only store the email address or phone number, this
won’t work. So we should warn people, and highlight that the
personalisation in the template is the problem, since this is what they
will need to change.

app/main/views/send.py

@@ -510,7 +510,7 @@ def choose_from_contact_list(service_id, template_id):
             current_service.id,
             template_type=template.template_type,
         ),
-        template=current_service.get_template(template_id),
+        template=template,
     )