Your suggestion does not work entirely because the posts overview from a menu item Blog shows a H1 description because of cat-sidebar.php. I changed this to:
Besides that, there is IMO a bug in the Archives page: instead of showing the name of the month in the header, it shows the date of the last post of that month… In the example it should say “Archief datum -> juli 2013′ instead of ‘Archief datum -> 04/07/2013’.