I seem to remember that you can edit the language files but it's pretty hazy. I think it was software called Pimp my Nav. I know it can be used to edit the speed camera files but not too sure about the languages. I have a copy but it's on a laptop I lent to my grandson over lockdown so not readily accessible at the moment.
Nich.
Nicholas John Peter Tinker - # 484
Manufactured on Tuesday 27th April 2004 @ 12.17.47.
Commission Number: 24468.
Brochure Model: M3 Tourer 4.6 V8 260PS.
Specification Code: L01B.
CICode: D1511.
Trim Level: TL8.9 (M3).
65th ZT-T 260SE to be made out of 115.
11th ZT-T 260 SE in Pearl Black (PBT) out of 23 produced. Manufactured in the UK by MG Rover Group Ltd.