They're parodies of French art nouveau works by Alfons Mucha. So the French is on purpose. (It just doesn't have the same effect in English.) But feel free to look up the translations if you don't know what they say.
Thanks! I'd been mulling over making these available as shirts for a long time, but finally went ahead and put them all up over at Society6.com/DiHA. (I did them individually since I think all together would be a bit too wide and each one would end up too small.)