MenuItem with ApplicationCommand doesn't get localized in self-contained deployment

* .NET Core Version: 3.1.9/3.1.403
* Windows version: 1909 10.0.18363
* Does the bug reproduce also in WPF for .NET Framework 4.8?: N/A

**Problem description:**
When you bind a command from `ApplicationCommands` such as `Save` to a `MenuItem`, it is supposed to display a localized label and key shortcut.

**Actual behavior:**
On a machine with de-DE locale and a window with `Window.Language = "fr-FR"`:

If the program is published as framework-dependent or run from the build directory, the menu item is "Speichern Strg+S" (i.e in German).

If the program is published as self-contained, the menu item is "Save Ctrl+S". Note that `CultureInfo.CurrentCulture` and `CultureInfo.CurrentUICulture` both return de-DE. Date and number formatting also follow de-DE culture.

**Expected behavior:**
In both cases the `MenuItem`should be localized to de-DE or fr-FR (not sure about the semantics of `Window.Language`).

**Minimal repro:**
Start with "WPF App (.Net Core)" template.

MainWindow.xaml:
```XAML

```

MainWindow.xaml.cs (default except command handler with optional test output):
```C#
using System;
using System.Globalization;
using System.Windows;
using System.Windows.Input;

namespace ReproPublish
{
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}

private void CommandSave_Executed(object sender, ExecutedRoutedEventArgs e)
{
MessageBox.Show(this, $"CC: {CultureInfo.CurrentCulture.Name}\nCUIC: {CultureInfo.CurrentUICulture.Name}\nTime: {DateTime.Today}\nNumber: {1.5}");
}
}
}
```