[gnome-software] Created tag 3.26.8

[Kalev Lember <klember src gnome org>]

The signed tag '3.26.8' was created.

Tagger: Kalev Lember <klember redhat com>
Date: 1523353936 +0200

    ==== Version 3.26.8 ====

Changes since the last tag '3.26.7':

Dz Chen (1):
      Update zh_CN translation

Kalev Lember (5):
      trivial: Post release version bump
      app row: Change the default for set_colorful to false
      app row: Fix reversed logic for making buttons insensitive
      app row: Never check the allow-cancel flag
      Release version 3.26.8

Marek Cernocky (1):
      Updated Czech translation

sujiniku (1):
      Update Japanese translation