[Checkins] [zopefoundation/Zope] a5cb4c: improve unsolicited translation avoidance (#879)

[Dieter Maurer]

  Branch: refs/heads/4.x
  Home:   https://github.com/zopefoundation/Zope
  Commit: a5cb4c75b9b07a408c22e6a2bc1fee05a3342be8
      https://github.com/zopefoundation/Zope/commit/a5cb4c75b9b07a408c22e6a2bc1fee05a3342be8
  Author: Dieter Maurer <d-maurer at users.noreply.github.com>
  Date:   2020-07-23 (Thu, 23 Jul 2020)

  Changed paths:
    M src/Products/PageTemplates/engine.py

  Log Message:
  -----------
  improve unsolicited translation avoidance (#879)

* improve unsolicited translation avoidance

* keep `Token` in exceptions for better error reports

* handle PY2 as well (even though no problems have been observed yet)

* - fix lint issue by defining unicode

* explain why the `Token` casting is safe

Co-authored-by: Jens Vagelpohl <jens at netz.ooo>