[i18n] Update Dutch translation horde

[Jan Schneider]

Zitat von Arjen de Korte <arjen+horde at de-korte.org>:

> The full file was rejected by the list server, so I'm now sending a  
> diff against Git master. I can also send the full file, just let me  
> now where to send it to.
>
> Best regards, Arjen

Committed, thanks. You could provide a download link or a linked  
attachment instead.

Jan.

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