Are you modding someone's pre-made ISO? Then your choices are limited, especially if they tampered with WinSxS. Normally all languages are integrated to a clean image first, updates next, and removals last.
If you are past that point, it's doubtful you can change the included languages. I think we're not talking about GamerOS anyway, so feel free to open a different topic thread, and keep this one for Gamer-OS only questions.
If you are past that point, it's doubtful you can change the included languages. I think we're not talking about GamerOS anyway, so feel free to open a different topic thread, and keep this one for Gamer-OS only questions.