I was bored, so I made a British English translation of the default English ini. Basically it's just the exact same with a few tweaks and every instance of "color" changed to "colour".

There aren't actually that many things that are severely American in Plus!, so the rest of the file is mainly untouched.

Gasp!
You missed my least favourite of the Americanisms, the evil "z" as in "Noah Webster is responsible for most of the bastardizations of the English language ". I have accordingly updated your translation, also with the British preferred spelling of the noun "licence" with a "c" not an "s" (note to Patchou: American dictionaries don't seem to care which spelling is used, so you could please twice as many sides of the Atlantic by using the "c" ) and a couple of corrections I just posted in another thread. Enjoy