Zope.app.i18n

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- Nothing changed yet.

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- Add compatibility with ``zope.i18n >= 4.7``. We fulfill the interface for
plural messages now, although we do not provide any implementation. This is
documented and raises NotImplementedError.

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- Add support for Python 3.7.

- Fix deprecation warning about importing IRegistered/IUnregistered from
their old locations in zope.component.interfaces instead of their current
locations in zope.interface.interfaces.

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- Add support for Python 3.5, 3.6 and PyPy.

- Replace dependency on ``ZODB3`` with ``BTrees`` and ``persistent``.

- Drop test dependency on ``zope.app.testing``.

- The synchronization view now uses Python's built-in transport for
handling Basic Authentication. As a reminder, Basic Authentication
does not permit a colon (``:``) in the username, but does allow colons
in the password (if the server properly conforms to the specification).

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- Fix translate() when used with ZODB 4.
- Remove test dependency on zope.app.component

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- Remove undeclared dependency on zope.deferredimport.
- Use zope.publisher >= 3.9 instead of zope.app.publisher.