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Some missing translations
Added these myself:
$Definition['Page Not Found'] = 'Pagina niet gevonden';
$Definition['The page you were looking for could not be found.'] = 'De pagina die je zocht, bestaat niet (meer).';
$Definition['No results for %s.'] = 'Geen zoekresultaten voor \'%s\'.';
Also, the correct spelling for "prive berichten" is "privé-berichten".
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