... do you have any idea how many hundreds of millions of pounds it costs to translate an entire suite of software from American English to British English?
Hey! Adding all of those unnecessary letters takes time. After all, I am sure that the word color is all throughout the program. Adding the "u" to make it colour could take a while.
If you didn't catch the jest in this post you may be humourless.
(Note: Funny how the spell checker allowed "colour" but not "humourless")