and rename SID_INSERTSYMBOL -> SID_INSERTSPECIAL in starmath to make it
unique

Change-Id: I0eeefe25e0e9374871c73793a31cb3e6cc445f73
Reviewed-on: https://gerrit.libreoffice.org/47369Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>