Merge pull request #1372 from TheLumbee/master

Grammatical correction for closing dialog.

flutter/lib/mobile/widgets/dialog.dart

@@ -6,7 +6,8 @@ import '../../models/model.dart';
 import '../../models/platform_model.dart';
 
 void clientClose(OverlayDialogManager dialogManager) {
-  msgBox('', 'Close', 'Are you sure to close the connection?', dialogManager);
+  msgBox('', 'Close', 'Are you sure you want to close the connection?',
+    dialogManager);
 }
 
 void showSuccess() {