https://manytools.org/http-html-text/browser-language/
Browser language - display the list of languages your browser says you prefer
What languages is my browser set to request? Display the list of languages your browser says you prefer.
list of languagesbrowserdisplaysaysprefer
https://www.loc.gov/standards/iso639-2/php/code_list.php
ISO 639-2 Language Code List - Codes for the representation of names of languages (Library of...
This document contains the ISO 639-2 Alpha-3 codes for the representation of names of languages
language codeisolistcodesrepresentation