Thanks Richie,
that really helped.
I also am now in the process of converting my changes to a child theme.
Previously I had hard coded the dutch language into your PHP files. I have now undone that and created nl.NL language files, which works fine.
On the converting to the child theme: that seems to behave strangely. So, I have a clean mesocolumn installation now, and added the child-theme by copying your mesocolumn-child folder to the folder where all the themes are, so besides the mesocolumn folder.
If I then switch to the child theme in wordpress, there are a few problems:
1) for the normal site (wider screen) to primary menu is all messed up. One menu item is missing, the order of items has changed and the category colors that I had defined are no longer there.
2) the mobile site (so screen width <770px) has also a problem with the menu: the 'select page' and 'select menu' options on top have disappeared. There is still a orange bar, but it is not as high as it should be.
Other than that the child theme works.
Any thoughts?
(If you want the put the previous topic down as 'resolved', then that is fine with me. I can then raise the child theme issue in a now topic.)
Thanks again.