[gdm] (15 commits) Non-fast-forward update to branch benzea/fix-unknown-session-crash

[Ray Strode <halfline src gnome org>]

The branch 'benzea/fix-unknown-session-crash' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  7ce3504... manager: Fix possible crash by initializing display
  48d91b2... manager: Always write out parameter

Commits added to the branch:

  b1074df... meson: Expose GDM XSession option to summary (*)
  7494be3... data: Remove deprecated StandardOutput=syslog (*)
  2c460be... Merge branch 'wip/issue623' into 'master' (*)
  a635365... Update Ukrainian translation (*)
  a74ed88... Update Ukrainian translation (*)
  fa5c225... Update Ukrainian translation (*)
  9c33a85... Update Ukrainian translation (*)
  d9571b4... Update Ukrainian translation (*)
  c872f54... Update Ukrainian translation (*)
  b3e9bf6... Update Ukrainian translation (*)
  0c2c523... Update Ukrainian translation (*)
  fbc3ef7... Update Ukrainian translation (*)
  6e6ba2f... Update Catalan translation (*)
  c836977... manager: Fix possible crash by initializing display
  f37d2f0... manager: Always write out parameter

(*) This commit already existed in another branch; no separate mail sent