Gateau is food cake in french
In Basque, Basque is called "Euskara."
A birthday cake in French is 'un gâteau d'anniversaire'
gâteau
A banana cake is "un gâteau à la banane" in French.
Kiaxo is 'Hello' in Basque.
gâteau sucré
0.078% of French population speak basque. Anyway, Basque in France is only spoken in the french Basque Country (Iparralde). In this area 22.5% of the people speak fluently basque and there's another 8.6% who understand it but can't speak it.
No, it is French.
If you mean a slice of cake it is - tranche
acheter un gâteau
"un gâteau parfait"