The repository that I have open sourced, as well as the zip file download in the first link has pre-built english pdfs you can just printout and play with.
The source code repository also includes the python utilities that will let you generate new gamebook pdfs, using the included or your own custom word lists, and will let you translate the words and instructions into other languages (japanese is included). If you can run python and you are on windows or linux x86 you should be able to use these utilities.
If you do make new translations and/or wordfiles, either merge them or send them to me and I can merge them into the official repository.
Note I went to the linked github page and dont see anything accessible (well, not to me at any rate).
It should be live and fully there.