When you add a license to your existing team, it will be the same language as your other licenses in the team.
I would suggest you to purchase a single license for your user in the non-english language.
This is exactly what I'm trying to do, but when i choose to purchase a new license it sends me directly to the team administration page where I only get the english language option.
The Creative Cloud pricing and membership plan sends me to the same team administration page.
I guess I will have to contact Adobe sales. Thanks for your help!
You are welcome!
P.S. when using Adobe forums, please mark helpful/correct responses of Staff/helper, if there are any.