That's actually an interesting question. I don't know of many programming languages that aren't in American English, and none in British English. Sorry!
That said, as a compromise, many languages (including C++) allow you to create aliases for types, variables, sometimes even functions. It's certainly not ideal, but it should be workable.
C and C++ actually go one step further and let you replace almost any text with any other text via macros, but... please try not to abuse that.