that doesn't mean a single thing - google would auto-default to IP country resolution every step. It's funny in an awful way to have a road trip in Europe - every day it's a different language. While I speak 3 languages that's far from sufficient, morealso google translations leave a lot to be desired outside English (as everything is designed in US,incl. date formats [mm/dd], units - inches and miles, etc.)

Accept-language doesn't do anything at all for google, either.