Just to add a bit...
There are some parts of DA (dynamically created messages mostly) that are hardcoded. So a rewrite of DA would be necessary before everything could be translated. I don't believe this is a high priority, but checking with the sales team would probably be a good idea.
and...
For the benefit of anyone who doesn't already know this, Japanese, and a few other languages, are coded completely differently, requiring two bytes for each character rather than one. While the latest versions of perl, php and mysql support this, I'm not sure if DA supports it fully or not.
Jeff