tests/test-gendoc-zh_CN.t

py3: convert user value to bytes by b'' prefix

This makes test-journal* pass on Python 3.5.

# skip-blame beacuse just b'' prefix

Differential Revision: https://phab.mercurial-scm.org/D3125

#require docutils gettext

  $ $TESTDIR/check-gendoc zh_CN
  checking for parse errors