Can we get a non US spellcheck option?

Constantly getting my documents looking crappy because they are littered with US specific spelling error flags, like where australians use S instead of Z for a lot of things or an extra u in color/colour etc. Is this hard to impliment I would imagine it would be doable, not sure how dedicated a non US customer base you have but if this feature exists already can someone let me know? Can’t find it in the editor options where I would imagine it would be if it was there. Thanks