Opt out for moderation messages

Right now, all admin-users seem to receive message when inappropriate content is reported. This is annoying since most people with admin-privileges are not involved in moderation. The generated email message is also cryptic, instead of "resource reported" one could say something more descriptive e.g. "content on the website [instance name] has been reported as inappropriate, please check by following the link below". We have more and more admins now and the message is confusing.