Change the localization of menu items in MasterDetailPage

Hello! I just can not understand what the problem is. Standard application with MasterDetailPage. I need the main menu items to change the text when the localization changes. The very change in the localization of text on the pages I did as described here, it works great.

MainPage.xaml looks like this:

<MasterDetailPage.Master>

    <ContentPage Title="Menu" BackgroundColor="#e8e8e8">

        <StackLayout Orientation="Vertical">

            <!-- 
         This StackLayout you can use for other
         data that you want to have in your menu drawer
    -->
            <StackLayout BackgroundColor="#e74c3c" HeightRequest="75">

                <Label Text="Main Menu"
                 FontSize="20"
                 VerticalOptions="CenterAndExpand"
                 TextColor="White"
                 HorizontalOptions="Center"/>
            </StackLayout>

            <ListView x:Name="navigationDrawerList"
              RowHeight="60"
              SeparatorVisibility="None"
              BackgroundColor="#e8e8e8"
              ItemSelected="OnMenuItemSelected"
              ItemTapped="OnMenuItemTapped"
              CachingStrategy = "RecycleElement"
             >
                <ListView.ItemTemplate>
                <DataTemplate>
                    <ViewCell>
                        <!-- Main design for our menu items -->
                        <StackLayout VerticalOptions="FillAndExpand"
                        Orientation="Horizontal"
                        Padding="20,10,0,10"
                        Spacing="20">
                            <Image Source="{Binding Icon}"
                            WidthRequest="40"
                            HeightRequest="40"
                            VerticalOptions="Center" />
                            <Label Text="{Binding Title}"
                            FontSize="Default"
                            VerticalOptions="Center"
                            TextColor="Black"/>
                        </StackLayout>
                    </ViewCell>
                </DataTemplate>
            </ListView.ItemTemplate>
            </ListView>
        </StackLayout>
    </ContentPage>
</MasterDetailPage.Master>

MainPage.xaml.sc:

public partial class MainPage : MasterDetailPage
{

    public ObservableRangeCollection<MasterPageItem> MenuList { get; set; }
    MyViewModel vModel = null;
    MasterPageItem gamePageItem = null;
    Binding gpBinding = null;

    public MainPage(MyViewModel viewModel)
    {
        InitializeComponent();

        vModel = viewModel;

        gamePageItem = new MasterPageItem() { Title = vModel.Resources["LearningMenuItemText"], Icon = "learning.png", TargetType = typeof(GamePage) };
        gpBinding = new Binding(path: "Resources[LearningMenuItemText]", source: vModel);
        gamePageItem.SetBinding(MasterPageItem.TitleProperty, gpBinding);
// Adding menu items to menuList
        MenuList = new ObservableRangeCollection<MasterPageItem>()
        {
            gamePageItem
        };

        // Setting our list to be ItemSource for ListView in MainPage.xaml
        navigationDrawerList.ItemsSource = MenuList;

This works, but ONLY ONCE, with the first change in localization. With subsequent changes in localization, the text of menu items does not change.
Any idea why?