How to Add a Custom Language in WordPress
For more information, check out: https://translatepress.com/?utm_sourc...
If you're looking to add a your own (custom) language to a multilingual WordPress site, TranslatePress lets you achieve this in just a few clicks.
https://translatepress.com/docs/devel...
You can add any language you want and translate your site in it, even if it's not among the languages supported by WordPress.