When you install additional languages into Telligent Community users have the option to choose one of those installed languages as their preferred language. This will mean all content not generated dynamically or by the users will be translated into that language. If someone is browsing the site and not logged in, the site will evaluate the Accept-Language HTTP Header sent by browser.
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When Would You Would Use ILanguageDetector?
As mentioned, a site uses the following logic to determine what language should be used. By default Telligent Community ships with U.S English as the language(en-US).