Why the hell would you do this?
I know it's only a few nore lines of code but why? I know some Cockneys and they seem to understand the words their slang replaces.
I'm all for fun, and this would be fun for someone like google to do (I'v not checked) but using it on a cash machine is like putting a comedy face on your safe dial -- annoying and pointless, unless the safe is impenetrable. Spend your time on making them work and getting rid of bugs, you stupid twats!