Tintin in Saint-Nazaire

A billboard in St Nazaire. An approximate translation is:

Tintin: And now, Captain, could you tell me finally where we go?
Captain Haddock: to Saint-Nazaire!

From TrekEarth

The original image is from the the Seven Crystal Balls. In the English edition is say “Westermouth”. Does anyone know if Saint-Nazaire is what appears in the original French version or has it been adapted for the advert?