When using the Multilingual App Toolkit you use the X:Uid to get a value from the string resource.

For Example:

 <TextBlock x:Uid="txtYourOrders" x:Name="txtYourOrders" TextAlignment="Center"></TextBlock>

If you have txtYourOrders.Text in your string resource, it’s value will be used as the Text content for the TextBlock

You can also reference resource names from your code behind like so:

Imports Windows.ApplicationModel.Resources

Private Shared _LANG_LOADER As New ResourceLoader()
txtYourOrders.Text = _LANG_LOADER.GetString("txtYourOrders/Text")

The important thing to note here is that instead of using a period (.) in the GetString call use a slash instead (/)