Update pt_BR dictionary

Change-Id: I5aea0c6761a1d58921e95c2fb6a559c63feec5ea
Reviewed-on: https://gerrit.libreoffice.org/7258
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>