Localize UWP application

Question

I have a resource file in the Strings folder and with subfolders for culture. See this image:

Also in appxmanifest I default to the value "en". But, unfortunately, the language does not change with the system language.

Did I miss something?

Repo link: https://github.com/NPadrutt/MoneyManager

EDIT: As suggested in the comments, adding this line of code to the OnLaunched Method in App.cs solved the problem:

        ApplicationLanguages.PrimaryLanguageOverride = GlobalizationPreferences.Languages[0];

Answer 1

As suggested in the comments, adding this line of code to the OnLaunched Method in App.cs solved the problem:

    ApplicationLanguages.PrimaryLanguageOverride = GlobalizationPreferences.Languages[0];

Answer 2

This is not tied to the OS system language (language pack), but rather to the user's preferred language:

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