Can you set "i18n": true ?
location : data\apotheosis\patchouli_books\apoth_chronicle\book.json
So that can translate the book to other language

minecraft version : 1.16.5
mod version : Apotheosis-1.16.5-4.8.99C

Hm, I didn't realize that was a thing I needed to do. I'll change that in the next update.