Misc/NEWS.d/next/Tests/2019-02-28-18-33-29.bpo-29571.r6b9fr.rst

Fix ``test_re.test_locale_flag()``:  use ``locale.getpreferredencoding()``
rather than ``locale.getlocale()`` to get the locale encoding. With some
locales, ``locale.getlocale()`` returns the wrong encoding.