How to change language(Localisation)

Hi I am not able to change language by clicking on button, I have used Multilingual.Plugin , it showing only in English even if i click on Fench it doesnt change..please help me with this
public ChangeLanguagePage()
{
InitializeComponent();
picker.Items.Add("English");
picker.Items.Add("Spanish");
picker.Items.Add("Portuguese");
picker.Items.Add("French");
picker.SelectedItem = CrossMultilingual.Current.CurrentCultureInfo.EnglishName;
}

     void OnUpdateLangugeClicked(object sender, System.EventArgs e)
    {

        CrossMultilingual.Current.CurrentCultureInfo = CrossMultilingual.Current.NeutralCultureInfoList.ToList().First(element => element.EnglishName.Contains(picker.SelectedItem.ToString()));
        AppResources.Culture = CrossMultilingual.Current.CurrentCultureInfo;
        App.Current.MainPage = new NavigationPage(new HomePage());

    }