At the moment, it is not possible to perform this kind of operation.
We are working on it and we hope that soon you will be able to use all available currencies to transfer money to your Vivid friends between Germany and France.
If you need to transfer money to your friends living abroad now, you are of course still able to send it in euros.
It is also already possible to transfer money in different currencies within a country (e.g. Germany or France).