Index: wp-includes/formatting.php
===================================================================
--- wp-includes/formatting.php	(revision 25764)
+++ wp-includes/formatting.php	(working copy)
@@ -798,6 +798,15 @@
 			$chars[ chr(195).chr(156) ] = 'Ue';
 			$chars[ chr(195).chr(188) ] = 'ue';
 			$chars[ chr(195).chr(159) ] = 'ss';
+		 }
+
+		if ( 'da_DK' === $locale || 'sv_SE' === $locale || 'nb_NO' === $locale || 'nn_NO' === $locale ) {
+			$chars[ chr(195).chr(134) ] = 'Ae';
+ 			$chars[ chr(195).chr(166) ] = 'ae';
+			$chars[ chr(195).chr(152) ] = 'Oe';
+			$chars[ chr(195).chr(184) ] = 'oe';
+			$chars[ chr(195).chr(133) ] = 'Aa';
+			$chars[ chr(195).chr(165) ] = 'aa';
 		}
 
 		$string = strtr($string, $chars);