[gnome-desktop] Created tag 3.31.4

[Matthias Clasen <matthiasc src gnome org>]

The unsigned tag '3.31.4' was created.

Tagger: Matthias Clasen <mclasen redhat com>
Date: 1546991923 -0500

    3.31.4

Changes since the last tag '3.31.3':

Andre Klapper (1):
      Replace Bugzilla by Gitlab URL in DOAP file

Bastien Nocera (2):
      thumbnail: Remove unneeded debug output
      Fix tags in Galician translation

Efstathios Iosifidis (1):
      Update Greek translation

Mart Raudsepp (2):
      thumbnail: bind mount /etc/ld.so.cache to the sandbox
      build: seccomp is not supported on 32-bit sparc

Matthias Clasen (1):
      3.31.4

Michael Catanzaro (1):
      Add CONTRIBUTING.md to discourage bug reports

Piotr Drąg (1):
      Revert "Update Greek translation"