Zope.app.locales

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- Add support for Python 3.5 and 3.6 and PyPy.

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- Add a test for the zcml_extraction.

- Remove zope.app.applicationcontrol and zope.app.appsetup dependencies.

- Add list of supported Python versions to Trove classifiers.

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- In version 3.7.2 msgids and default values were forced to be
``unicode``. This was too strict because at least the TAL extractor returns
UTF-8 encoded default values. Fixed this by allowing the default value to
be a string again.

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- i18nextract bugfix: _("msgid", mapping={...}) does not have a default, just
like _("msgid"). Previously it would get a ``. Default: ""`` annotation in
the .pot file.

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- Handle Unicode msgids and default values.

- Consistent sorting of source filenames for each msgid. Also sort line
numbers numerically, not lexicographically.

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- Fix nl translations.

- Updated Brazilian Portuguese translation [erico_andrei]