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If the site exists in more than one language, the server will return a page in the language defined by the user agent, if the ressource is available in that language.
Makes it possible, if necessary, for the user agent to choose the right document according to the set language.
Use content negotiation provided by the server by testing the values in the header HTTP Accept-Language. On this subject read : Apache language negotiation set up.
Change the default language preferences of your browser and navigate the site.