Translated variable name to English  nZchPos => nCharPos

Change-Id: I8ad44252f980921f71259b1d62636a8f4979f0c0
Reviewed-on: https://gerrit.libreoffice.org/8869
Tested-by: David Tardon <dtardon@redhat.com>
Reviewed-by: David Tardon <dtardon@redhat.com>