Nl translation updates

Adding, updating Dutch translations
Dat klopt, maar de volledige vorm "die moeten worden geladen" is wel weer erg formeel

On June 16, 2014 5:54:26 PM CEST, Thom Wiggers <notifications@github.com> wrote:
>> @@ -312,7 +312,7 @@ msgstr "Mailboxen die we indexeren"
>>  
>>  #: mailpile/defaults.py:29
>>  msgid "Plugins to load on startup"
>> -msgstr ""
>> +msgstr "Plugins geladen bij opstarten"
>
>'to load' is gebiedende wijs.
>
>---
>Reply to this email directly or view it on GitHub:
>https://github.com/pagekite/Mailpile/pull/708/files#r13813258

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