Add missing `en.notification_mailer.status.subject` (#15564)

* Add missing `en.notification_mailer.status.subject`

* Update en.yml

config/locales/en.yml

@@ -1048,6 +1048,8 @@ en:
       body: 'Your status was boosted by %{name}:'
       subject: "%{name} boosted your status"
       title: New boost
+    status:
+      subject: "%{name} just posted"
   notifications:
     email_events: Events for e-mail notifications
     email_events_hint: 'Select events that you want to receive notifications for:'