Sony Xperia 10II - Android app - PayPal language problem

I have installed PayPall app for Android on my SailfishOS. (other android apps are working well)
If I have my mobile in english language mode the application is working well.
If I use a other language (eg. german) the application is starting, I logg in and the the application is writing that german language files getting loaded … and then the application is geting small.
Any idears?