build documentation fails

[karawitan]

Hello,

This project looks very interesting. I'd like to build and read the doc, but on debian:11.3, the build process fails with:

mkdocs build -f mkdocs-fr.yml -d site-fr
ERROR   -  Config value: 'markdown_extensions'. Error: Failed loading extension "pymdownx.superfences".
ERROR   -  Config value: 'plugins'. Error: Plugin value: 'lang'. Error: "fr" is not a supported language code.

Aborted with 2 Configuration Errors!
make: *** [run] Error 1

I have the following mkdocs packages installed:

mkdocs mkdocs-doc mkdocs-bootstrap mkdocs-nature

Any hint ?

[karawitan]

hem ok, pymdown-extensions not available as standard debian package.