Pilatus PC-6 Sorting Change + ICAO Type Designator and ATC Model Name Fix (Multiple Languages)

This addon updates the names of the PC-6 variants to more closely match the naming conventions used by other default aircraft with variations, like the Cessna 172. This addon also fixes the text-to-speech ATC and pilots simply referring to the plane as a "Pilatus" with a missing model name. Furthermore, this addon changes the aircraft's ICAO Type Designator from "PC6" to the correct "PC6T".