It's a variant spelling still occasionally used in British English, mostly in the names of organizations. I imagine whoever was localizing it noticed that (or w

It's a variant spelling still occasionally used in British English, mostly in the names of organizations. I imagine whoever was localizing it noticed that (or was an idiosyncratic Brit that actually preferred it) (My spellcheck is similarly keen on changing -ise suffixes to -ise even though both are valid in British English and the OED actually marginally prefers it for words like 'organize')