User blog comment:Master Sima Yi/Assassinews 09-07-'12 — Assassin's Creed film news/@comment-5174994-20120709182414/@comment-4043223-20120709201219

It doesn't mean you have to be british. It is the UK and EU way of spelling English words. Americanized english loses the "u" and changes "s" to "z" in some cases for some reason.