Nuget packages containing localized resources not working with UWP/UAP. Is there a workaround?

[Stefan-deHoDev]

Installing a nuget package that has localized resources in an UWP app, you can only access the default language resources.

How to reproduce:
-1. Create blank UWP app
-2. Install localized nuget package, you can use this test package I created:
Install-Package LocalizationTest
-3. Add this code to MainPage.xaml

 <StackPanel>
            <Button Content="languagetest"
                    Click="Button_Click" />
            <TextBlock x:Name="output"
                       Style="{StaticResource BodyTextBlockStyle}" />
        </StackPanel>

-4. Add this code to MainPage.xaml.cs

        public void Write(String t)
        {
            output.Text += t + Environment.NewLine;
            System.Diagnostics.Debug.WriteLine(t);
        }
        private void Button_Click(System.Object sender, RoutedEventArgs e)
        {
            String en = LocalizationTest.Resources.Strings.ResourceManager.GetString("Language", new System.Globalization.CultureInfo("en"));
            String de = LocalizationTest.Resources.Strings.ResourceManager.GetString("Language", new System.Globalization.CultureInfo("de"));
            String en_Us = LocalizationTest.Resources.Strings.ResourceManager.GetString("Language", new System.Globalization.CultureInfo("en-US"));
            String de_DE = LocalizationTest.Resources.Strings.ResourceManager.GetString("Language", new System.Globalization.CultureInfo("de-DE"));
            Write(String.Format("Strings:en {0}, de {1}, en_US {2}, de_DE {3}", en, de, en_Us, de_DE));
            var map = Windows.ApplicationModel.Resources.Core.ResourceManager.Current.AllResourceMaps.First().Value;
            var element = map.First(x => x.Key.Contains("LocalizationTest"));
            Write(element.Key + Environment.NewLine + getLang(element.Value));
        }
        public String getLang(Windows.ApplicationModel.Resources.Core.NamedResource r)
        {
            String ret = "";
            foreach (var item in r.Candidates)
            {
                ret += item.ValueAsString + Environment.NewLine;
            }
            return ret;
        }

-5. Start the app, press the button, You only get the english strings.

Do the same steps with an blank Windows 8.1 app and you get german and english strings.

If, instead of adding the nuget package, you reference the LocalizationTest.dll directly, you get the same result in an UWP app.

For reference:
Output in a Windows 8.1 app:

Strings:en english, de german, en_US english, de_DE german
LocalizationTest.Resources.Strings/Language
english
german

Output in a UWP app:

Strings:en english, de english, en_US english, de_DE english
LocalizationTest.Resources.Strings/Language
english

Again: The UWP output is the same as the Windows 8.1, when referencing the LocalizationTest.dll directly instead of using the nuget package.

This is using the newest NuGet version and Visual Studio 2015 Update 2.

If anyone can figure out a workaround that would very much be appreciated!

[rrelyea]

Unfortunately there is no way around this at the moment. One needs to use fat packages for this.
Duplicate of #2245

[Stefan-deHoDev]

Wait, I'm telling you fat packages are not working!

This package is a normal Portable Class Library with multiple languages inside. It's not possible to access the other languages inside that Portable Class Library. (That's the definition of a fat package, is it not?)

[Stefan-deHoDev]

Can this be reopened? The issue was missunderstood. This is NOT a duplicate of issue #2245

I apologize, the title should have been worded differently. I edited the title to make it more clear.