fdo#39468 Translate German comments in sc/source/core/data/validat.cxx

Change-Id: I38cbd03c8e0bbcc780b48b08b6129f710102783b
Reviewed-on: https://gerrit.libreoffice.org/11247
Reviewed-by: Thomas Arnhold <thomas@arnhold.org>
Tested-by: Thomas Arnhold <thomas@arnhold.org>