Plone.app.vocabularies

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- Remove "Discussion Item" from BAD_TYPES vocabulary.
[timo]

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- Translation of workflow states vocabularies didn't work in some contexts.
[thomasdesvenain]

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- Update license to GPL version 2 only.
[hannosch]

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- Internationalized editor label (especially for 'None' value).
[thomasdesvenain]

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- Use the standard libraries doctest module.
[hannosch]

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- Add a vocabulary to list all Keywords (via the Subject index).
[esteele]

- Avoid ConstraintNotSatisfied-error when GS-importing the default navigation
portlet. Fixes https://dev.plone.org/plone/ticket/8380
[WouterVH]