feat: update document title display name

@@ -1967,7 +1967,9 @@ App.prototype.updateDocumentTitle = function () {
 
 		if (file != null) {
 			var filename = (file.getTitle() != null) ? file.getTitle() : this.defaultFilename;
-			title = filename + ' - ' + title;
+			// title = filename + ' - ' + title;
+			// TODO thingskit not display file suffix name
+			title = filename.replace(/\.drawio/g, '');
 		}
 
 		if (document.title != title) {

@@ -20,8 +20,9 @@
 
 	/**
 	 * Specifies the app name. Default is document.title.
+	 * TODO thingskit delete prefix
 	 */
-	Editor.prototype.appName = 'diagrams.net';
+	Editor.prototype.appName = '';
 		
 	/**
 	 * Known file types.

@@ -3553,7 +3553,8 @@ EditorUi.prototype.updateDocumentTitle = function()
 	
 	if (this.editor.appName != null)
 	{
-		title += ' - ' + this.editor.appName;
+		// TODO thingskit delete '-'
+		// title += ' - ' + this.editor.appName;
 	}
 	
 	document.title = title;