Language is not changeable in the app
We absolutely must be able to change the app’s language. There are reasons people set their device language other than their native language. My phone is set to German to assist my learning German. When I’m playing Magic I am not engaged in a languagelearning exercise; I am engaged in playing Magic.
I understand why the developers may have thought it was a good idea to use the system language, but as a developer myself I must say this decision does not pass any further level of thought about the user journey. Use the system language to set a default, by all means, but not having a user setting for this is just silly and naive.

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RoKing18#10776 commented
Agreed! This is such a small change but would make a world of difference.