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Paypal regionalization Problem in Firefox

Hello,
I experienced a small bug in the PayPal integration.
My site is in German. While designing all in Chrome is looked fine.
Now I tried to check out in Firefox and Safari and The PayPal buttons are in English.
Same is for the credit card integration.
In Chrome when clicking on credit card. The Form below is in German.
But in Firefox and Safari there is a standard, US oriented Form.

Does someone know how to fix this?
https://magnuss-shop.webflow.io