I’m not certain, but i believe it might set the language based on your phones language. Did you change that recently?

I noticed the same thing after the last update. I would also prefer English as the interface language. Before the update everything was in English and now I have a mix of German and English. I already selected English as the interface language on the website but it didn’t chance the ones in the app. In the app itself I haven’t found any settings regarding this. I’m sure this is because my device language is German.