Both sides committed war crimes, but in World War One I do believe Germany was just as bad as the allied powers, in fact, it may be an unpopular opinion, but Germany had more justification to go to war than the other powers when you actually read about why they were involved.
It should probably still be highlighted in some way, i definitly didnt see it even when looking there, and you dont zoom in everywhere in an apparently empty lot
https://en.wikipedia.org/wiki/Category:World_War_I_crimes_by_the_Allies