System wide change of "RT"

Is it possible to make a system-wide change of the string “RT” on the
web interface and in email messages? I believe this is in accordance
with the license agreement but please, if I’m wrong about that, let me

I would like to name the system “webtracker” rather than RT on the all
interfaces a user can see. For example, “RT at a glance” would become
"Webtracker at a glance" and anywhere else “RT” would appear.

Many thanks!