I've found this blog entry that talks about setting up BC sites for other countries.
At the bottom, Jodie also has links to:
I have a question back to the BC team, if you select a language for a site domain, are all system labels ( E.g. "item(s)" ) translated to the selected language?
Thanks for sharing your links. I think I have already done as described, and my problem is more related to the non-customizable strings in BC (like 'item(s)'). Since I asked the question, the problem has developed, which You can see here: http://forums.adobe.com/thread/1097673
We hope that BC can offer a solution soon.
Cheers for the feedback and the forum link.
I see from the other thread that jQuery is a way forward, to perform find-and-replace on labels etc.
I suspected that this may be the solution.