Thanks Nich. Found this Googling around: https://pimp-my-nav.software.informer.com/1.0/
The description appears to point at it being suitable for adding POI's, Speed Camera data etc. though, rather than fiddling with deeper firmware like language files.
If time (and funds) permit, I may have a go at getting a Resler adapter and purchase a copy of NavCoder. It looks like it has a few potential uses other than just this language problem.
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