armour vs armor in source

[Jurriaan]

in golem-graveyard\npcs.lua, I see

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type="armour"

almost everywhere else, this is spelled 'armor' in the source (except for a comment in data/damage-types.lua).
The one other exception is shertul-fortress-training-orb, which has

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game:registerDialog(GetQuantity.new("Armour", "From 0 to 1000", 0, 1000, function(qty)

which is probably OK. It is strange that the source has armor, and the texts / UI has armour.