Change summary "Popular photo manager"
If i search for Shotwell in GNOME Software the first text i see after the application name is:
Popular photo manager
https://gitlab.gnome.org/GNOME/shotwell/-/blob/master/data/org.gnome.Shotwell.appdata.xml.in#L9
I guess i don't find the word "Popular" particularly interesting since i don't think it says anything about the software. Since this is the first thing the user might see before installing the software i think it would be important to have a good string here.