Fix mentions and notifications drawer.

Thanks to xet7 !

Fixes #6062,
fixes #6003,
fixes #5996,
fixes #5720,
fixes #5911,
fixes #5792,
fixes #5163,
fixes #4431,
fixes #4126,
fixes #3363,
fixes #3150

client/components/notifications/notification.jade

@@ -5,6 +5,8 @@ template(name='notification')
       +notificationIcon(activityData)
     .details
       +activity(activity=activityData mode='none')
+      .notification-date
+        small.quiet {{activityDate}}
     if read
       .remove
         a(title="{{_ 'delete'}}") 🗑️