I have the same setup.Languages are: UK English, German, Spanish, French, Portugese, Italian, Russian, Dutch, Polish, Swedish and Turkish.
My SW version is 3.08.15128.EA.10_PRODUCT
Nav application version: 4.66.5
Map version: F5
This is one of the actions that is carried out at the "upfitters" location across the street from the factory and part of why it takes so long before our cars actually leave the factory.It probably means that all our mustangs are built with US software and then, before leaving the plant, they update them with EU software.