You can set per-application language settings in macOS. Go to System Preferences -> Language & Region -> Apps. Click the + button to add an app then choose the language you want.
You can also do this in iOS and iPadOS. Go to Settings, scroll down to the bottom where your app is listed, tap on its settings, then click on Language.
You can also do this in iOS and iPadOS. Go to Settings, scroll down to the bottom where your app is listed, tap on its settings, then click on Language.