I guess you need at least one person on your QA team who is proficient in a top-down right-to-left language and can read and use the non-standard layouts. And I

I guess you need at least one person on your QA team who is proficient in a top-down right-to-left language and can read and use the non-standard layouts. And I believe that exclusively "top-down right-to-left" spells "Mongolian". Common Asian (CJK) languages have an _option_ to write text vertically, but they are usually written left to right in the digital media. So basically the same UI layout works for Japanese and for Norwegian users. Horizontal right-to-left languages like Arabic might flip the layout horizontally, but they don't break vertical scrolling.