If anyone tries lolypop000's files, please let us know if they worked.

I contacted garmin about adding voices/vehicles and this is the response I got:

Thank you for contacting Garmin International. The Kenwood GPS units do not have the ability to load extra voices or vehicles.

The language settings are controlled by the Kenwood software. There is no way to change the navigation language to Spanish without changing the Kenwood language setting.