How about an online documentation here

[compsystems]

I think the easiest thing is to adapt the following content or documentation to hp-prime

eng
http://www-fourier.ujf-grenoble.fr/~pari...index.html

And complement it with the official documentation that is in French.

frn
http://www-fourier.ujf-grenoble.fr/~pari...index.html

I like the interface of NEW-RPL documentation
https://newrpl.wiki.hpgcc3.org/doku.php