To change your default language. Open up the app on your smartphone and log in with your credentials.
Once the app is open, click the profile icon in the bottom right corner – that will open up the profile settings.
Inside the profile settings, there is an option called Language, this might vary according to your current language. If you click that option, a list of available languages will show – now simply click your desired language and press change.
Now the app will reload itself and all text will now be in your preferred language.