This affects a displayed name of months e.g. grouped by in a pivot table.
See <http://listarchives.libreoffice.org/ja/discuss/msg02906.html> for the
original discussion.

Change-Id: I2ff0325f9ef2f2f03019291d4b760582b6dfbad8
Reviewed-on: https://gerrit.libreoffice.org/8678Reviewed-by: Eike Rathke <erack@redhat.com>
Tested-by: Eike Rathke <erack@redhat.com>