It's the French for beach (pronounced plazh), so it's possible to hear it used in English in the UK, as many people study French at school. Also, according to the Oxford English dictionary, it means an unusually bright spot on the sun. plage noun Astronomy an unusually bright region on the sun. ORIGIN C19: from French, literally 'beach'.

Do you mean plague? Plage means a fashionable beach according to my dictionary, but I’ve never heard it used.