Where are the dictionaries of the VKB stored?

Currently, only few languages are supported. And unfortunately I am Dutch, which isn't supported. That isn't a big problem as I would use the phone in English anyway. But a Dutch prediction for the VKB would be very welcome. If I only knew where the dictionaries are stored, I could add it myself. Does anyone know: 1.- Which prediction software Jolla uses (I thought XT9 because of many references) 2.- Where the dictionaries are stored.