....what was the question?The TeamSite authoring interface will respond to your browser's "Accept-Language" header. It defaults to English, but if you have any of the following languages set to a higher priority, it'll use that for most but not quite all interface elements: german, spanish, french, italian, japanese, korean, and a few variations of chinese. Vietnamese is not one that is supported by the TeamSite interface, and there's no (supported) way to make it happen.