add variable to File menu and embed new access to Digital Signature
update to <h1>,<h2>
some updating to <menuitem>,<keycode> in File menu
Change-Id: Icdad0659bf45fc521fee4056d0071240717c19f9
Reviewed-on: https://gerrit.libreoffice.org/c/help/+/104590
Reviewed-by: Seth Chaiklin <sdc.blanco@youmail.dk>
Tested-by: Jenkins