The mput command can copy multiple files (with wildcards, so a whole folder is simply *.*). And you can fully automate the process using Windows ftp-program run in batch mode, as documented in http://support.microsoft.com/?kbid=96269
That takes care of the 'fixed' content of the sites, if they use physically separate html-files (which shouldn't be necessary, I think).

Then find out how to make an html-page from an Excel spreadsheet, and automate it to make 12 separate ones. Any other database than Excel would do also, of course.
Then use batch mode ftp again to transfer those.

Consider, however, to use some server side scripting (like PHP using a MySQL-database, both totally free) to generate the contents of the localized page automatically. That way, all you've got to do is maintain the central database (and, of course, the html-pages with fixed contents).

Hope this helps.


Kees