[gnome-shell] Created tag 3.28.0

[Florian Müllner <fmuellner src gnome org>]

The signed tag '3.28.0' was created.

Tagger: Florian Müllner <fmuellner gnome org>
Date: 1520888054 +0100

    Tag release 3.28.0

Changes since the last tag '3.27.92':

A S Alam (1):
      Update Punjabi translation

Anders Jonsson (1):
      Update Swedish translation

Balázs Úr (1):
      Update Hungarian translation

Chao-Hsiung Liao (1):
      Update Chinese (Taiwan) translation

Florian Müllner (1):
      Bump version to 3.28.0

Jordi Mas (1):
      Update Catalan translation

gogo (1):
      Update Croatian translation