how to install Dutch Language pack?

Hey everyone,

I'm new to concrete (and loving it), but I'm from the Netherlands. So I'd like to change the website to dutch, specifically the user part (dashboard is no problem in English). Now i have found a great way to do most of it by installing a nl_NL language pack:

However it doesn't change the blog post's "previous/next/posted by/read full post" to dutch. It also changes some sentences to dutch except for one or a couple of words. Anyone has a clue how to change that to dutch?

Some examples are in the attachment.


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12345j replied on at Permalink Reply
the packages may not have been translated.
5Numb3rs replied on at Permalink Reply
De nederlandse vertaling is 100% compleet.
Soms zijn bepaalde items niet vertaald.
In het geval van de blog posts "Posted by" mist er een verwijzend stukje code, hier een voorbeeld.

Regel 27
Posted by <?php  echo $author; ?> on <?php  echo $date; ?>

Dit moet eigenlijk zijn:
<?php echo t('Posted by') ?> <?php  echo $author; ?> on <?php  echo $date; ?>
5Numb3rs replied on at Permalink Reply
Always latest nl_NL downloads for C5 v5.5.x.x: