I realized recently, when I go to my profile settings on the website and change my preferred language to whatever language, I can not get this information using the account API. Whatever I change my language to, the iso_639_1 field is always de. The iso_3166_1 field however does change when I change my country setting. This is the only setting, I am not able to change as far as I can see. Is there a reason for it?

Also, is there a way of changing account data using the API or any plans to support this in the future?

Thanks in advance