in google's analytics you can see what languages visits your site with percentages and visit numbers. are there languages that google doesn't recognize? or even case sensitive typical languages that aren't read? like USA's English is "en-us". what if there's a browser, or even a browser extension that cases it "english-usa"? would google not recognize that? thanks in advanced for your replies.
Seems like Google should understand every language, and if "en-us" is transferred as "english-usa" as you pointed out, Google may be make a guess based on the IP or some context.
They can do it base on IP. For example, if you have an australian IP and type in google.com you will get redirected to google.com.au