I would like to see numbers used for gallery folders on the file system, instead
of a gallery name. This number would be the gallery ID, so that it's always
unique. I would like this so that it doesn't matter if a gallery is renamed
later; there would be no mismatch of folder names and titles.

Secondly, this ID should automatically be created, rather than asking the user
to input a folder name. Users find this very confusing.