Deki helps Mozilla developers collaborate

Agreed -- it sounds like an ad. I got finished reading it, and I didn't really understand what
it offers over other solutions. Take this for example:

"The polyglot can distinguish between different languages across a single system so it's no
longer necessary for IT professionals to allocate sections of a web site's infrastructure to
overcome language barriers. Instead, multiple languages are consolidated into one system and a
site's pages are then localized according to user settings."

I'm not any wiser after having read that. What is a polyglot? How do IT professionals
"allocate sections of a web site" for different languages today? What's novel about they way
they're doing it?