I'm looking for a way to get the name of a language in any other language, based on a IETF language tag. For example: I have a list of IETF language tags ('en', 'fr', 'nl', 'de' , ...) and I want them mapped to the language display name of my current locale (e.g. Dutch):
- 'en' => 'Engels'
 - 'fr' => 'Frans'
 - 'nl' => 'Nederlands'
 - 'de' => 'Duits'
 
I've searched NPM but found nothing. I would prefer a list in JSON, but I will settle for any language/format.