[Checkins] [zopefoundation/zope.app.i18n] 7be450: Have a link to a github issue in the error.

[Steffen Allner]

  Branch: refs/heads/plural-translations
  Home:   https://github.com/zopefoundation/zope.app.i18n
  Commit: 7be450d4c5127fded44b4b2168ab15ed7484197f
      https://github.com/zopefoundation/zope.app.i18n/commit/7be450d4c5127fded44b4b2168ab15ed7484197f
  Author: Steffen Allner <sa at gocept.com>
  Date:   2020-10-07 (Wed, 07 Oct 2020)

  Changed paths:
    M src/zope/app/i18n/interfaces.py
    M src/zope/app/i18n/messagecatalog.py
    M src/zope/app/i18n/tests/test_translationdomain.py
    M src/zope/app/i18n/translationdomain.py

  Log Message:
  -----------
  Have a link to a github issue in the error.

We want the user to immediately know, where he can get help. We also want only one place to configure this link.