[otrs] Responses in 3.0.x

Hi, I just upgraded my OTRS system from 2.3, which only supported plaintext for email interactions, to 3.0.12, which supports HTML (nice job!). My responses and auto-responses have been converted into HTML, but I had a surprise when I wanted to edit one: the variables had disappeared. But since they work as before I didn't really care, but I was just wondering how to edit them. If I edit the source of the message, I can see the variables. Is that the way to edit variables? Thanks, Ugo