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Enable to apply LanguageCode to `lang` attribute of `<html>` element
In this change, we are able to use LanguageCode in the config.toml to lang attribute of the <html> element.
lang attribute has an important role in the behavior of screen readers in web accessibility (details).
ref.
- https://gohugo.io/getting-started/configuration/#languagecode
- https://github.com/gohugoio/hugo/blob/90da7664bf1f3a0ca2e18144b5deacf532c6e3cf/tpl/tplimpl/embedded/templates/alias.html#L2