Replace single ellipsis in buttons of sw/

Change-Id: I45737508d05d65ca7ed223672cfa5bc7bd66b5bc
Reviewed-on: https://gerrit.libreoffice.org/13342Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>