Xamarin.Forms: Localization of the UWP app

Question

If I run my app on an UWP device I get the following warning in the Output window:

MakePRI : warning 0xdef00522: Resources found for language(s) 'en,de' but no resources found for default language(s): 'de-DE,en-US'. Change the default language or qualify resources with the default language. http://go.microsoft.com/fwlink/?LinkId=231899

Don't know if this is related, but I also get

1>C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\v14.0\AppxPackage\Microsoft.AppXPackage.Targets(2459,5): warning : APPX4001: Build property AppxBundlePlatforms is not explicitly set and is calculated based on currently building architecture. Use 'Create App Package' wizard or edit project file to set it.

This page states, that I have language specific resources, which I haven't qualified with the language tag. How can I find out, which resources these are?

I have images in the Assets folder, but they are language independent ones. Furthermore, I've set the default language in the Package.appxmanifest to de-DE. If I search for the language abbrevation from the warning, I can only find a priconfig.xml and AppxManifest.xml, both in the Debug output folder.

What should I do to remove this warning?

Edit:

The warning seems to disappear if I add a AppResources.en-US.resx file (currently I have en-US set as default language in Package.appxmanifest). Additionally, I have a file for AppResources.de.resx and AppResources.resx (should be en). But why does the sample project doesn't need such a file, despite there should be the same settings? What I'm missing?

Answer 1

The warning seems to disappear if I add a AppResources.en-US.resx file (currently I have en-US set as default language in Package.appxmanifest). Additionally, I have a file for AppResources.de.resx and AppResources.resx (should be en). But why does the sample project doesn't need such a file, despite there should be the same settings? What I'm missing?

As you said, the AppResources.resx is en. And you could expand the Properties node in the Portable Class Library (PCL) project and double-click on the AssemblyInfo.cs file. Add the following line to the file to set the neutral resources assembly language to English:

[assembly: NeutralResourcesLanguage("en")]

This informs the resource manager of the app's default culture, therefore ensuring that the strings defined in the language neutral RESX file (AppResources.resx) will be displayed when the app is running in one the English locales.

You have set en-US as default language in Package.appxmanifest, However, there is no such file corresponding to it. So it will throw warning.

The default language of the sample project is en-US, and there is no such file corresponding to it. It also throw the same warning in my side. if you modify the default language to en, the warning disappear. Because it has set AppResources.resx as en in AssemblyInfo.cs file.

Foe more you could refer to AssemblyInfo, Supported languages.