After some of the discussions kicked off by T228397, we want to make two changes to the bank account field:
- In order to get a better idea to see if most people use IBANs or classic German bank accounts, we should add Matomo Events to the bank data component (possibly the blur event?) and count the number of times either option was used.
- Additionally, the bank data component currently expects a BIC to be entered for international IBANs even though the BIC is never used. The component should be refactored so that the BIC field is disabled on international IBANs and the (already existing) placeholder "Wird automatisch ermittelt" is shown to the user.