Search:

No.

Fork the 158 branch, copy the files into a vanilla ZC158a.
To convert to ZC158-type lang. files. there is a tool that does most of the heavy-lifting:...

Doesn't look like there is an up-to-date one, but this should still mostly work:

https://github.com/Zen4All-nl/Dutch-Language-Pack-for-Zen-Cart/tree/1.5.8

I suggest you fork it so you can add...