PLT-2971 Added email footer for address (#3319)

* Added email footer for address

* added default

* Update html.go

* Changed according to PM

i18n/en.json

@@ -1363,6 +1363,10 @@
     "id": "api.templates.email_footer",
     "translation": "To change your notification preferences, log in to your team site and go to Account Settings > Notifications."
   },
+  {
+    "id": "api.templates.email_organization",
+    "translation": "Sent by "
+  },
   {
     "id": "api.templates.email_info",
     "translation": "Any questions at all, mail us any time: <a href='mailto:{{.SupportEmail}}' style='text-decoration: none; color:#2389D7;'>{{.SupportEmail}}</a>.<br>Best wishes,<br>The {{.SiteName}} Team<br>"