In Irish it's: capall órga (of colour) / capall óir (of metal)
"Gaelic" can mean "Irish Gaelic' or "Scottish Gaelic". They are classified as two distinct languages.
'Horse' doesn't mean anything in Gaelic; it's an English word.
each
In (Scottish) Gaelic: òrdha, òrach; In Irish (Gaelic): óir (of the metal) órga (gold in colour)
Capall.
Òrach, òrdha
The Irish Gaelic word is capall. The Scottish Gaelic is each. The Welsh word is ceffyl or march. The Cornish word for Horse is Margh. There is not a single Celtic language but six. The others are Manx Gaelic and Breton.
In Irish it's "spiorad an chapaill"
Scottish Gaelic: marcachadh Irish Gaelic: marcaíocht
No you must use one golden apple per horse.
A palomino
a palimino.