Fixed up the text creation placement

NetworkDiagram/MainWindow.xaml

@@ -42,8 +42,8 @@
                 
                 <StackPanel Orientation="Horizontal" HorizontalAlignment="Right" VerticalAlignment="Center">
                     <ComboBox x:Name="LangCombo" Width="70" Height="30" SelectionChanged="LangCombo_SelectionChanged">
-                        <ComboBoxItem Tag="en">EN</ComboBoxItem>
+                        <ComboBoxItem Tag="en" IsSelected="True">EN</ComboBoxItem>
-                        <ComboBoxItem Tag="cs" IsSelected="True">CZ</ComboBoxItem>
+                        <ComboBoxItem Tag="cs">CZ</ComboBoxItem>
                     </ComboBox>
                 </StackPanel>
             </DockPanel>

NetworkDiagram/MainWindow.xaml.cs

@@ -607,7 +607,14 @@ namespace NetworkDiagram
 
         private void WireTool_Click(object sender, RoutedEventArgs e) => _activeTool = ConnectionType.Wire;
         private void WifiTool_Click(object sender, RoutedEventArgs e) => _activeTool = ConnectionType.Wifi;
-        private void AddText_Click(object sender, RoutedEventArgs e) => AddDeviceToCanvas(new DeviceTemplate { Name = "Note", IconPath = "" }, 100, 100);
+        private void AddText_Click(object sender, RoutedEventArgs e)
+        {
+            // Center of the current viewport in canvas coordinates
+            double centerX = (CanvasViewport.ActualWidth / 2 - CanvasTranslate.X) / CanvasScale.ScaleX;
+            double centerY = (CanvasViewport.ActualHeight / 2 - CanvasTranslate.Y) / CanvasScale.ScaleY;
+            
+            AddDeviceToCanvas(new DeviceTemplate { Name = "Note", IconPath = "" }, centerX, centerY);
+        }
 
         private void ExportPng_Click(object sender, RoutedEventArgs e)
         {

NetworkDiagram/devices.json

@@ -54,5 +54,9 @@
   {
     "Name": "Wireless Router",
     "IconPath": "Assets/wireless router.jpg"
+  },
+  {
+    "Name": "Video camera",
+    "IconPath": "Assets/video camera.jpg"
   }
 ]