version fix for z3c.unconfigure
mr.dev, always checkout for base buildout config!
ical importer: Fix default value for imported attendees and categories

Return an empty tuple instead of None so that the edit form can be
rendered.
correct language
add plone.po files for other languages too, to translate view names
add plone.po files for other languages too, to translate view names
Merge branch 'master' of git://github.com/plone/plone.app.event
Don't validate end dates for open ended events, fixes #97