https://github.com/phug-php/website/tree/master/doc
To translate the documentation in a new language, copy a directory from a language you understand to the language you want to add.
For example, if you can read english and write spannish, you can
copy doc/en directory to doc/es, then translate files in it.
https://github.com/phug-php/website/tree/master/resources/lang