SharePoint Server 2010 and SharePoint Foundation 2010 have now released in 3 more languages: Irish, Macedonian and Vietnamese.
These new "Language packs" enable creation of sites and site collections in multiple languages without requiring separate installations of SharePoint Server 2010 or SharePoint Foundation 2010. Multiple language packs can be installed on the same server.
The three languages are available for download here
For detailed usage information, visit the following sites: