[ale] language(locale) detection in gmail

[jjj863 at gmail.com (Jerry Yu)]

Reading an email in Chinese, I noticed that all sponsored links served by
gmail are in Japanese. With my limited Japanese training (one year in
college), I can tell the links, albeit in wrong language, are actually
pertinent to the content of  the email.
This comes to a question, anybody know how google,or anybody for the matter,
detect the locale (charset encoding?), given a chunk of text?
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