Fix locale check when checking for non-printable chars while validating data dirs #4934
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As far as I know
locale -areturns results in the formC.utf8,en_US.utf8, etc notC.UTF-8, at least it does on the machines I have access to. This means that the check for non-printable characters invalidate_data_dir.shfails on any system that doesn't have theen-US.UTF-8locale installed.