Already heard about Collabtive? Very easy deployment on your own webserver (or via Debian sources), FOSS:
Disclosure: I'm one of the lead devs.
Disclosure: I'm one of the lead devs.
But you're right, the user should be able to select the language on the online demo before login. I will add this to my TODOs. Thx!
One of the burdens that comes with more than 40 locales... ;-)