set language.resx to auto generate the designer class

This avoids the need to manually regenerate the Language.Designer.cs file.

Note that in VS the file Language.Designer.cs will appear under Language.resx but the actual file locations have not changed.

mRemoteNG/mRemoteNG.csproj

@@ -97,6 +97,11 @@
   </ItemGroup>
 
   <ItemGroup>
+    <Compile Update="Language\Language.Designer.cs">
+      <DesignTime>True</DesignTime>
+      <AutoGen>True</AutoGen>
+      <DependentUpon>Language.resx</DependentUpon>
+    </Compile>
     <Compile Update="Properties\OptionsBackupPage.Designer.cs">
       <DesignTimeSharedInput>True</DesignTimeSharedInput>
       <AutoGen>True</AutoGen>
@@ -468,6 +473,14 @@
     </Resource>
   </ItemGroup>
 
+  <ItemGroup>
+    <EmbeddedResource Update="Language\Language.resx">
+      <Generator>ResXFileCodeGenerator</Generator>
+      <CustomToolNamespace>mRemoteNG.Resources.Language</CustomToolNamespace>
+      <LastGenOutput>Language.Designer.cs</LastGenOutput>
+    </EmbeddedResource>
+  </ItemGroup>
+
   <ItemGroup>
     <PackageReference Update="chromiumembeddedframework.runtime.win-x64" Version="92.0.25" />
   </ItemGroup>