Display <day of week> <day> <month> on the lock screen for the Greek locale

[Claus7]

1)lsb_release -rd
Description: Ubuntu Kinetic Kudu (development branch)
Release: 22.10

2)apt-cache policy locale-package-el
language-pack-el:
  Installed: 1:22.10+20220827
  Candidate: 1:22.10+20220827
  Version table:
 *** 1:22.10+20220827 500
        500 http://gr.archive.ubuntu.com/ubuntu kinetic/main amd64 Packages
        500 http://gr.archive.ubuntu.com/ubuntu kinetic/main i386 Packages
        100 /var/lib/dpkg/status

3)in lock screen it is expected to have:
day(weekday)-number(day of month)-month e.g. Friday 2 September (in greek Παρασκευή 2 Σεπτεμβρίου)

4)instead we see: day-month-number e.g. Friday September 2 (Παρασκευή Σεπτεμβρίου 2)

[Daniel van Vugt (vanvugt)]

Using en_AU here and I can confirm that gnome-shell just seems to make its own date format. It's nothing like the locale definition, which you can see by running:

locale d_fmt
locale date_fmt

So we can't automatically get a right answer.