Wpd-countdown

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* configlet for date and link
[Gomez]

* renamed from wpd.mmxi.countdown to wpd.countdown
[Gomez]

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* add german transations [pbauer]

* make link translateable [pbauer]

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* i18n support [erico_andrei]

* Countdown portlet [davilima]

* Initial release [erico_andrei]