App: WPF .Net 4.6.1 I set the language of the main window to `Language = System.Windows.Markup.XmlLanguage.GetLanguage(CultureInfo.GetCultureInfo("de").IetfLanguageTag);` In any [IValueConverter](url) i get 'de-DE' as culture, which has 'de' as parent. So translating like ``` internal class CultureReturningConverter : IValueConverter { private static ITranslation SomeTranslation = Translation.GetOrCreate(Properties.Resources.ResourceManager, nameof(Properties.Resources.SomeTranslation)); public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { return SomeTranslation.Translate(culture); } public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) { throw new NotImplementedException(); } } ``` is not possible, because the Translator doesn't know 'de-DE'.  Is it a wanted behavior or a bug? Should the Translator also check the parent culture on [Translate(culture)](https://github.com/GuOrg/Gu.Localization/blob/master/Gu.Localization/Translator.cs#L91)? Or is it simply a fault of mine?
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