OK thank you. I think you're right, it's Staphylea colchica known for his flowers with almond perfume The tree is also know as American bladdernut or false pistachio tree. The seed seems edible...
Oh, you all jumped in while I was typing. There are several species. I'm seeing the common name for S. colchica as Georgian Bladdernut, which might make more sense for the location. I'm seeing S. trifolia called American Bladdernut. I just watched a video in German, a language I don't know so I didn't understand it all, but I think one point made was that the seeds in S. colchica are not attached and you can hear them move around when you shake the pouch. I remember S. pinnata seeds as being attached. The video said that the inflorescence on pinnata is more compact.
There's a leaf with 5 leaflets at the bottom of the pic, so it's almost certainly Staphylea pinnata, which is also by far the most likely species at this location. The other species are usually just trifoliate (S. colchica can have 5 leaflets, but is rare in cultivation in W Europe).