Plone.formwidget.captcha

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- Nothing changed yet.

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* Add empty ``plone.pot`` file for ``rebuild_i18n.sh`` script to work.
[davidjb]

* Add Czech translation
[naro]

* Add French translation
[cedricmessiant]

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* Add Brazilian Portuguese and Spanish translations.
[hvelarde]

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* Add i18n option and translate to dutch
[maartenkling]

* Use widgets view class attributes in the template.
[romanofski]

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* Use hashlib module by default.
[thomasdesvenain]

* Zope 2.13 imports (removes warnings under Plone 4.1)
[thomasdesvenain]

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* Specify allowed_attributes for the captcha view, so the image/audio pages
are accessible in Zope 2.12.9+.
[hannosch]

* Move to plone.app.discussion-captcha feature declaration to meta.zcml.
[timo]

* Fix verify method for empty string input values. This is necessary for
plone.app.discussion 1.0b5 compatibility.
[timo]