I believe that adding the option to change the language of the app will help both the users and the owners of the application and it will bring much more people who will be happy to use bunq. Out there are still a lot of people who don't speak English and when they download the app and open it, the first thing to see is the bunq logo and colours, the second thing is list of countries and their national flags.
THIS WILL AUTOMATICALLY GRAB THE PERSON BECAUSE THE FIRST THING ONE PERSON WILL REALIZE IS THAT HE HAVE THE FREEDOM OF CHOICE AND THEY WILL CHOOSE TO USE BUNQ FIRST BECAUSE SOME FRIEND TOLD THEM ABOUT IT AND HOW USEFUL IT REALLY IS BUT THEN THEY MAKE A STEP BACK WHEN THE FRIEND TOLD THEM THAT IS IN ENGLIS. AND HERE COMES THE MOMENT WHEN THE SECOND WINDOW OPENS AND THE USER THINKS "OH NOW I CAN WORK WITH THIS APP"