/? /equip command, OFF vs SUB?

[Phenidate]

Possible translation error when calling up the help text on /equip with the /? slash command

This is printed (copy/pasted from in game chat window. Emphasis placed on incorrect name)

USAGE: /equip [slot] [item name]→Equips an item to a specified slot.If an item name is omitted, the item currently equipped to that slot will be unequipped.
>>Gear Slots: main, off, throwing, pack, pouch, head, neck, L.ear, R.ear, body, shirt, hands, L.index, R.index, L.ring, R.ring, L.wrist, R.wrist, waist, legs, garment, feet.

Off is the wrong term however, macros use the 'sub' term for offhand items. (it may be possible its a translation error in the macro then?) Following the help text on this macro will only cause an error.

(For those curious as to what it should look like in macro form, see below)
the command below fails
/equip off "Bronze Scythe"
the command below works
/equip sub "Bronze Scythe"