support for dynamic switching languages

src/Shared/HandyControlDemo_Shared/UserControl/Controls/SpriteDemoCtl.xaml

@@ -3,10 +3,11 @@
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              xmlns:hc="https://handyorg.github.io/handycontrol"
              xmlns:langs="clr-namespace:HandyControlDemo.Properties.Langs"
+             xmlns:ex="clr-namespace:HandyControlDemo.Tools.Extension"
              DataContext="{Binding SpriteDemo,Source={StaticResource Locator}}"
              Width="300"
              Background="{DynamicResource RegionBrush}">
     <hc:TransitioningContentControl>
-        <Button Margin="32" Command="{Binding OpenCmd}" Content="{x:Static langs:Lang.OpenSprite}"/>
+        <Button Margin="32" Command="{Binding OpenCmd}" Content="{ex:Lang Key={x:Static langs:LangKeys.OpenSprite}}"/>
     </hc:TransitioningContentControl>
 </UserControl>