TL;DR
How can I compile kaobook template with greek language using XeLaTeX?
I have been trying to compile kaobook with XeLaTeX for a book in greek language without success.
The template uses polyglossia package. When changing the language to greek with \setmainlanguage{greek} it doesn't compile returning a misleading error about the fonts that turned out to be irrelevant. After setting the fonts explicitly it return an other error. Finaly I figured out that there was a problem with the kaorefs.sty and the definitions there but I could not go further.
