use i18n in event confirmation email

locales/email/en.json

@@ -18,5 +18,8 @@
     "admin_register": {
         "subject": "New registration",
         "content": "{{user.email}} has requested registration on {{config.title}}: <br/><pre>{{user.description}}</pre><br/> Confirm it <a href='{{config.baseurl}}/admin'>here</a>."
-    }
+    },
+    "event_confirm": {
+        "content": "You can confirm this event at <a href='{{url}}'>this page</a>"
+    }    
 }