This patch sets the function names of add-in functions as set
in the golbal configuration of LibreOffice ('Use English Function names')

Changing this setting has not yet an immediate effect. (I'm still working on
that, which is a hard nut to crack.) The add-in function names are set at
start up of calc.

Change-Id: I5fffd9edb09647c1bcd0c3f35ffa6ab69ef48589
Reviewed-on: https://gerrit.libreoffice.org/6032Reviewed-by: Eike Rathke <erack@redhat.com>
Tested-by: Eike Rathke <erack@redhat.com>