Smaller titles for modal dialogs

core/modules/utils/dom/modal.js

@@ -30,7 +30,7 @@ Modal.prototype.display = function(title,options) {
 		modalBackdrop = document.createElement("div"),
 		modalWrapper = document.createElement("div"),
 		modalHeader = document.createElement("div"),
-		headerTitle = document.createElement("h1"),
+		headerTitle = document.createElement("h3"),
 		modalBody = document.createElement("div"),
 		modalLink = document.createElement("a"),
 		modalFooter = document.createElement("div"),