I installed the Magento admin via directadmin.
Now I have the following error I got the magento put on Dutch but both the front and back office remains the default language.
Also, I am also testing the produchten but he does not show the picture.
I hope someone can help me?
Example link: http://www.naamketting4you.nl/moeder-collectie.html
1) For now, the Dutch language package is not shipped with Magento 2.
There is the nl_nl folder, but it is just a stub: https://github.com/magento/magento2/tree/cf7df72/app/i18n/magento/nl_nl
You should install the Dutch language package separately.
2) I see the product picture correctly on your site.