[gnome-desktop] Created tag 3.31.91

[Abderrahim Kitouni <akitouni src gnome org>]

The signed tag '3.31.91' was created.

Tagger: Abderrahim Kitouni <akitouni gnome org>
Date: 1550655849 +0100

    gnome-desktop 3.31.91

Changes since the last tag '3.31.90':

Abderrahim Kitouni (1):
      Prepare 3.31.91

Bastien Nocera (1):
      ci: Don't fail on glib2 reinstallation

Efstathios Iosifidis (1):
      Update Greek translation

Jeremy Bicha (1):
      ci: Don't require gnome-common or intltool

Jordi Mas (1):
      Update Catalan translation