use curly quotes in success message

routes/index.js

@@ -28,7 +28,7 @@ router.post('/invite', function(req, res) {
         if (body.ok) {
           res.render('result', {
             community: config.community,
-            message: 'Success! Check "'+ req.body.email +'" for an invite from Slack.'
+            message: 'Success! Check “'+ req.body.email +'” for an invite from Slack.'
           });
         } else {
           var error = body.error;