ICONS: fix icons in galaxy and tango and added new icons to sifr and tango

Change-Id: Ia0a48d0d366cf108b3eaad0b08822be9c4da087a
Reviewed-on: https://gerrit.libreoffice.org/13129
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>