Tango icon updates

Change-Id: I6fdef095912a80302ee74c9dfd9c7349dd827a68
Reviewed-on: https://gerrit.libreoffice.org/10492
Reviewed-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>