A month or two ago I noticed that the interface of my Facebook Messenger app on my iPhone is in Czech when I send images, etc. from other applications using the share button. However, when I use the Messenger application directly, the application's interface is in English. How can I fix this so that the interface is in English like the rest of my iPhone's interface?
As a concrete example, with a photo selected in the Photos app, I tap the share button and select the Messenger application to send it through. The interface is in Czech. For instance, the search bar placeholder text says “hledejte lidi, skupiny a firmy”, and the cancel/send buttons are also in what appears to be Czech.
Per this Reddit thread, it appears that I am not the only person to have run into this situation.
Per the Reddit thread, it appears that people are having this issue in iOS 10.3.3 and 11.0. I don't know if this affects other versions of the OS.