In particular not when reading documents as we don't know what the
original (default/system) locale was when the date format was
created and stored and whether the format's date order actually
matched the locale's ordering.

Regression from

    commit 51478cef
    CommitDate: Tue Apr 18 17:01:27 2017 +0200

        Resolves: tdf#107012 follow date order of the target locale

Change-Id: I9d3bdbd512d95ed81ff6459e368a2d7497ec8a2d
Reviewed-on: https://gerrit.libreoffice.org/59182Reviewed-by: Eike Rathke <erack@redhat.com>
Tested-by: Jenkins