tasks #6740: Display artifact color in references sidebar

+ position fixed

Change-Id: I40ffc1ec77b71aefed0c2ff9f338991699675bb1
Merge commit 'refs/changes/39/2339/1' of ssh://gerrit.tuleap.net:29418/tuleap into HEAD

* ssh://gerrit.tuleap.net:29418/tuleap:
  tasks #6740: Display artifact color in references sidebar

Change-Id: I534f44ed195aa74a83766bad195c80301bc38073
This is Tuleap 6.12.99.77

Change-Id: Iab1648951c83ec598ecac2c7e2df092c7a7f0d1c