The special cases for the icon themes with the filenames
"images_hicontrast.zip" and "images_tango_testing.zip" are now handled.
They will be displayed as "High Contrast" and "Tango Testing"
respectively.

Change-Id: Ia3c2b8b57809db9c5ed132c42a412157e91b2599
Reviewed-on: https://gerrit.libreoffice.org/14574Reviewed-by: Yousuf Philips <philipz85@hotmail.com>
Tested-by: Yousuf Philips <philipz85@hotmail.com>
(cherry picked from commit 2a0118a9)
Reviewed-on: https://gerrit.libreoffice.org/15925Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>