Moderators reading messages in Staff Action Logs

[zogstrip]

@fefrei

The biggest one we found: Moderators can currently read every single message that contains a link to an external image, because @system downloads the image, edits the post, and this is added to staff action logs.

I don’t think those edits should be logged.

@david can you make sure we don’t log those very specific edits from the @system user? (and remove the existing ones)