Hi Philip,
No problem, worse things happen...
Nevertheless, I don't think the file which has to be adjusted can be found in the backend. At least, I couldn't find it there. I did find it though, via FTP: public_html/administrator/language/en-GB. Perhaps that's what you meant with backend and I've misread?
This is not to have some kind of attitude or something like that, absolutely not, you're the one with the knowledge, which is highly appreciated. But I thought perhaps someone else is looking for this as well, you never know...
Anyway: it's solved, so thank you very much for the help!
Best regards,
Ans