This reminds me of an anecdote about an Intellivision game about American history that was required to be reprogrammed about Canadian history. As a joke the original Canadian retooling simply added “eh?” to every line of the American one (“Washington crosses the Delaware, eh?”)
The US version of Diddy Kong Racing contains an inaccessible Japanese language setting in the files. If the code is modified to activate it, it is revealed that all it does is replace text with the word "Japanese" in English.