I stand corrected Â

I always assumed the
*.lng file was a 'compiled' file that could not be altered...
dogbog, to change it is easy (I've just tried):
I'm assuming you are using english as the language and that you are on Windows
On your device go to the file .rockbox/langs/english.lng file and open it in a suitable editor
Find the string you want to modify, change it and save the file.
To make it take effect, you have to run the language file. In Rockbox, go:
Setting > General Settings > Language and 'play' or select english as the language.
Et voilá, modified menu entries

It's stuff like this that just makes me love Rockbox more...