change string 'Close' to lowercase for dialog (#2366)

boot/boot.js

@@ -136,7 +136,7 @@ $tw.utils.error = function(err) {
 			heading = dm("h1",{text: errHeading}),
 			prompt = dm("div",{text: promptMsg, "class": "tc-error-prompt"}),
 			message = dm("div",{text: err}),
-			button = dm("button",{text: ( $tw.language == undefined ? "Close" : $tw.language.getString("Buttons/Close/Caption") )}),
+			button = dm("button",{text: ( $tw.language == undefined ? "close" : $tw.language.getString("Buttons/Close/Caption") )}),
 			form = dm("form",{children: [heading,prompt,message,button], "class": "tc-error-form"});
 		document.body.insertBefore(form,document.body.firstChild);
 		form.addEventListener("submit",function(event) {

core/modules/utils/dom/modal.js

@@ -122,7 +122,7 @@ Modal.prototype.display = function(title,options) {
 				attributes: {
 					text: {
 						type: "string",
-						value: ( $tw.language == undefined ? "Close" : $tw.language.getString("Buttons/Close/Caption") )
+						value: $tw.language.getString("Buttons/Close/Caption")
 			}}}
 		]}],
 		parentWidget: $tw.rootWidget,