Z3c-recipe-i18n

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- Add support for Python 3.9.

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- Fix extraction on Python 3 by requiring a more recent version of
`zope.app.locales`.

- Add support for Python 3.8.

- Drop support for Python 3.4.

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- Require zope.app.locales >= 4.0 to get rid of code copied from there.

- Add support for Python 3.7.

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- Python 3 compatibility.

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- Depend on zc.buildout 2.0+. Features introduced with zc.buildout 1.5 are removed (don't work with the 2.x branch).

- Update trove classifiers to show that this package is currently only
compatible with Python 2.7.

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- Exit with a non-zero status code when one or more msgmerge calls fail.

- Use subprocess instead of os.system.