When selecting the option of "auto language selection", what parameter QuestionPro reads exaclty

I understand QuestionPro uses content page, can you please confirm if the content that is used is the “lang” on the html, like this: https://drive.google.com/file/d/1sUyY1BqFArLEiH5CGO9dlevWUATbBFkK/view?usp=drivesdk

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