fix typo in CallStackPad

src/AddIns/Debugger/Debugger.AddIn/Debugger.AddIn.addin

@@ -77,12 +77,12 @@
 		</Condition>
 		<MenuItem id="AddExpressionBreakpoint"
 		          insertafter="Toggle Breakpoint"
-		          label = "${res:XML.MainMenu.DebugMenu.AddExpressionBreakpoint}"
+		          label = "${res:MainWindow.Windows.Debug.AddExpressionBreakpoint}"
 		          shortcut="Shift|F7"
 		          class = "Debugger.AddIn.AddExpressionBreakpointCommand"/>
 		<MenuItem id="AddWatchExpression"
 		          insertafter="AddExpressionBreakpoint"
-		          label = "${res:XML.MainMenu.DebugMenu.AddWatchExpression}"
+		          label = "${res:MainWindow.Windows.Debug.AddWatchExpression}"
 		          shortcut="Ctrl|F7"
 		          class = "Debugger.AddIn.AddWatchExpressionCommand"/>
 	</Path>

src/AddIns/Debugger/Debugger.AddIn/Pads/CallStackPad.cs

@@ -116,15 +116,15 @@ namespace ICSharpCode.SharpDevelop.Gui.Pads
 		
 		void RefreshPad()
 		{
-			Thread thead = WindowsDebugger.CurrentThread;
-			if (thead == null) {
+			Thread thread = WindowsDebugger.CurrentThread;
+			if (thread == null) {
 				listView.ItemsSource = null;
 			} else {
 				var items = new ObservableCollection<CallStackItem>();
 				bool previousItemIsExternalMethod = false;
 				WindowsDebugger.CurrentProcess.EnqueueForEach(
 					listView.Dispatcher,
-					thead.GetCallstack(100),
+					thread.GetCallstack(100),
 					f => items.AddIfNotNull(CreateItem(f, ref previousItemIsExternalMethod))
 				);
 				listView.ItemsSource = items;