But I don't have Apple Noté 4 sur 5 étoiles

Does exist some way to achieve the flushcards by Windows?

Not at the moment

Send me an email at martin@vocabulous.net and I'll let you know when the webapp comes around.

Noté 4 sur 5 étoiles

The addon itself works as described, but the site itself is empty, alhough I signed in to it...

Try the iOS app

Yes, the webapp is unfortunately still quite empty. If you have an iOS device you can practice your translated words there. Check out vocabulous.net for more info.