tests/test-gendoc-zh_TW.t

tests: add b'' prefixes to badserverext.py

This avoids a handful of failures due to missing str and bytes.

# skip-blame: just a bunch of b'' prefixes

Differential Revision: https://phab.mercurial-scm.org/D5750

#require docutils gettext

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