Comment 6 for bug 121563

another way to do this is to modify the edge (and maybe staging) configs to include a "is_edge true" flag and then customize the tal in main-template to recognize this such that edge produces something like:

"© 2004-2008 Canonical Ltd. | Version pre-1.2.3 revision 5753"

also my comments about demo above are incorrect. There is a tal condition for demo which puts appends DEMO to it.
So it would read: "Copyright 2004-2007 Canonical Ltd. | Version 1.1.11 revision 5381 | DEMO"

if we want to follow the same convention then edge might look like

"© 2004-2008 Canonical Ltd. | Version 1.2.3 revision 5753 | EDGE"