Those sites are not relying on accept-language, but rather on IP geolocation to select the default language. I sometimes use a non-US proxy when I'm feeling vigilant, and Google always uses the IP of the proxy to determine what language to serve me (even though my browser accept-language hasn't changed).
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Those sites are not relying on accept-language, but rather on IP geolocation to select the default language. I sometimes use a non-US proxy when I'm feeling vigilant, and Google always uses the IP of the proxy to determine what language to serve me (even though my browser accept-language hasn't changed).