support for dynamic switching languages

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

@@ -3,12 +3,13 @@
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              Background="{DynamicResource RegionBrush}"
              xmlns:langs="clr-namespace:HandyControlDemo.Properties.Langs"
+             xmlns:ex="clr-namespace:HandyControlDemo.Tools.Extension"
              DataContext="{Binding ImageBrowserDemo,Source={StaticResource Locator}}"
              xmlns:hc="https://handyorg.github.io/handycontrol">
     <hc:TransitioningContentControl>
         <StackPanel Margin="32">
             <hc:ImageViewer Background="{DynamicResource SecondaryRegionBrush}" Width="600" Height="330" ImageSource="/HandyControlDemo;component/Resources/Img/1.jpg"/>
-            <Button Margin="0,32,0,0" Command="{Binding OpenImgCmd}" Content="{x:Static langs:Lang.OpenImageBrowser}" Style="{StaticResource ButtonPrimary}" HorizontalAlignment="Center"/>
+            <Button Margin="0,32,0,0" Command="{Binding OpenImgCmd}" Content="{ex:Lang Key={x:Static langs:LangKeys.OpenImageBrowser}}" Style="{StaticResource ButtonPrimary}" HorizontalAlignment="Center"/>
         </StackPanel>
     </hc:TransitioningContentControl>
 </UserControl>