Switch from en-CA to sv-SE for date formatting; en-CA no longer produces yyyy-mm-dd date strings

htdocs/ViewData.vue

@@ -117,7 +117,7 @@
 	}
 
 	function date_header(date) {
-		var datestr = date.toLocaleDateString('en-CA');
+		var datestr = date.toLocaleDateString('sv-SE');
 		var timestr = date.toLocaleTimeString('en-GB');
 		return {
 			datestr, timestr,