How can i change site language ?

<!DOCTYPE html><html class="no-js" lang="en-US" prefix="og: http://ogp.me/ns#" prefix="og: http://ogp.me/ns#" itemscope="itemscope" itemtype="http://schema.org/WebPage">

I've check in woorank, they said "The language you have specified for your website is different than the language detected by Google™". So how can i change this lang from "en-US" to "vi-VN"

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