model.* is already made these were duplicates

src/main/resources/assets/customnpcs/lang/en_US.lang

@@ -126,15 +126,6 @@ gui.edit=Edit
 gui.reset=Reset
 scale.shared=Shared
 
-npc.head=Head
-npc.body=Body
-npc.arms=Arms
-npc.rarm=Right Arm
-npc.larm=Left Arm
-npc.legs=Legs
-npc.rleg=Right Leg
-npc.lleg=Left Leg
-
 remote.title=Nearby NPCs
 remote.reset=Reset
 remote.tp=Tp to