Email footer discussion threads

We are using the latest version 3.4.0.5.
When we start a discussion with authors they get an email. In that email is a footer with the workflow thread -->—
Reply to this comment at

We wish to change this and add more info down below in order to make sure authors really login and not email us. Is there 1 specific file/template in the backend for this? I checked the forum but couldn’t find the answer I was looking for.
Thank you in advance.