Thanks for the answer. So finally i could be setting up my own server and share the pictures with there and properly access them? 
I abused my own Nextcloud with Nextcloud maps sometimes. Maybe thats something for the local chapter here 
GeoVisio - OpenStreetMap Wiki Here its called GeoVisio, maybe the site needs a rework?
And, if i join http://panoramax.fr/ everything is french for me 
(Ah, found an open issue on the github Add button to change langage · Issue #30 · panoramax-project/panoramax-website · GitHub )