Language Mapping

The current implementation does not follow the language mapping specified here:

https://developers.google.com/recaptcha/docs/language

I would be happy to write a routine that maps between the Drupal language codes and the reCAPTCHA language codes.

In the mean time, is there a Drupal HOOK that would allow me to change:

<script src="https://www.google.com/recaptcha/api.js?hl=zh-hans" async defer></script>

to:

<script src="https://www.google.com/recaptcha/api.js?hl=zh-CN" async defer></script>

in the of a page? I tried MODULE_library_alter() from MODULE.theme but could not make the needed change.