update names of menu items for sending e-mails

Change-Id: Ice0d739cfbff72d30635c7acfcd728c71ee63808
Reviewed-on: https://gerrit.libreoffice.org/11809
Reviewed-by: Samuel Mehrbrodt <s.mehrbrodt@gmail.com>
Tested-by: Samuel Mehrbrodt <s.mehrbrodt@gmail.com>