Support des pauses via l'API et l'éditeur de synthèse vocale

We've introduced a feature that allows for pauses in speech through our API and the Speech Synthesis page. To add a three-second pause using SSML, you can for example input: "Martin walked down the street{" "} {``} he looked into the camera and laughed." Breaks currently have a maximum duration of three seconds and can be passed directly into the text passed to our API. They will be billed at 10 characters each.