Localization in WPF MVVM

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C#5.0

Hi ,
I need to change culture mainly between two languages ; italian and English using the Combobox in WPF MVVM.
I tried to databind the ViewModel with my Mainview but I didn't succeed.
I will be so thankful if someone could help.

Here is my Combobox declaration in xaml :

<ComboBox IsEditable="True" Text="Language" HorizontalAlignment="Right" VerticalAlignment="Top" Width="95"  Margin="34,21,34,0" ItemsSource="{Binding Languages}" SelectedItem="{Binding SelectedLanguage, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Foreground="#FF434C64" removed="Green" Height="24.96"  />

Here is View Model definition :

public void ChangeLanguage()
         {
             if (SelectedLanguage == "en")
             {
                 Thread.CurrentThread.CurrentUICulture = new System.Globalization.CultureInfo("en");

             }
             else
             if (SelectedLanguage == "it-IT")
             {
                 Thread.CurrentThread.CurrentUICulture = new System.Globalization.CultureInfo("it-IT");
             }

         }

Here the declaration within the construcor of my View Model

public ViewModel()
       {

           LoadData();
           ChangeLanguage();

           Login = new DelegateCommand(this.Logging, delegate()
           {
               return (!String.IsNullOrEmpty(Username) && !String.IsNullOrEmpty(Password) && !String.IsNullOrEmpty(Email));
           });
           Register = new DelegateCommand(this.Registering, delegate()
           {

          return (!String.IsNullOrEmpty(Username) && !String.IsNullOrEmpty(Password) && !String.IsNullOrEmpty(Email));



       });