This is totally new for me, so it is possible that I am completely on the wrong track.
I was asked to translate the portal to dutch, meaning that the user would like to see "Klanten" instead of "Customers" in the left navigation. My research on this topic lead me to the
So, dutch language pack installed, I created a new group, with one item, "Customers" and set the Dutch value.
What is not clear from here is how can I use this translation?