Export function

Hi, after clicking EXPORT: 

- sometimes it fails with message "Firebase.GoogleAPI can not..."

- the name of the file.ZIP is very random instead of the name of the Project + date

- when extracting then launching the index.html, some pictures disappear (not all), some texts disappear, animations disappear 

- pictures are not exported locally, they stay on Firebase.GoogleAPI so it's a problem to install on our own hosting

21 July 2021

Michael