Collective-folderishtypes

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- Add Transifex.net service integration to manage the translation process.
[macagua]

- Added Spanish translation.
[macagua]

- Updated gettext files support.
[macagua]

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- Moved to named behaviors.
[iham]

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- Add support for Python 3 and Plone 5.2.
[pbauer]

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- Use 'getAllowedSizes' from CMFPlone if available to allow AT free use
[tomgross]

- Change portlets to support z3c.form and make it Plone 5 compatible (no more formlib).
[thet]

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- Configure folderish types to use the ``plone.content.itemView`` caching
ruleset instead the folderView one.
[thet]

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- Fix redirection to parent context after editing for Archetypes. We cannot
import something from Acquisition in a Filesystem script.
[thet]