Know anywhere to find the english documentation ?
There was never a proper English version of any of it. We translated the help-file for QGEN back when we made the first Mod for 'Girl Life' -can be found
here. Same forum section also has the great splitter-tool made by
Oiz . Very helpful once you decide to either code in Notepad++ or when you want to split the source into proper sections that can go into a Git.
That translation was both machine done and hand-corrected based on google-translated wiki info. The original wiki for QSP is
You must be registered to see the links
and any half-decent translation programme like DeepL, Google/Bing Translate etc should help you along to be able to read it. Most of the wiki is actually the same as you find in the help-file except there are some more examples in the wiki. Most of the better knowledge I gathered for myself actually came from digging into the forum there since people tend to ask the same questions no matter what their native language is. You find a lot of nice examples for things there too.
The language itself is really no biggy if you understand any other programming language but the combination of a command to some pre-defined part of the player takes some time to get used to for many. You can use that feature or avoid it altogether but that comes with extra work then for other stuff. The player is basically a specialized form of a browser which is also the reason why many display commands are actually html. Original QSP used a special form of html4 implementation - Sonix's player got rid of that and allows to use proper html5 instead.