Update dutch translations.

svncommit

2011-02-15 3221c95a29c19677ff7c82e259aa683de4c224e7

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<div id="header"><a href="./"><img id="logo" src="/images/roundcube_logo.png" alt="logo" title="<roundcube:object name='productname' />" /></a></div>
 
<roundcube:object name="message" id="message" />