en_tn/jdg/09/57.md

made all the evil of the men of Shechem turn back on their own heads

"Evil turn back on their heads" here is an idiom. Alternate translation: "punished the men of Shechem for all the evil they had done" (See: rc://en/ta/man/jit/figs-idiom)

on them came the curse of Jotham son of Jerub Baal

This is an idiom. Alternate translation: "the curse of Jotham son of Jerub Baal happened to them" (See: rc://en/ta/man/jit/figs-idiom)

Jerub Baal

This is another name for Gideon. See how you translated this name in Judges 6:32.