What does `hl` stand for? [closed]

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Various Google API endpoints and webpages use a hl=<language code> parameter in the query string to set the language. Example

hl=en

or

hl=no

What does hl stand for?

Answer 1

It stands for "host language", according to this page

Answer 2

It is not intuitively obvious, but hl designates the web interface language per this page.