Merge pull request #11897 from unoplatform/dev/cdb/bugs/ios-datepicker-display

Fixed ApplicationLanguages initialization on iOS

src/Uno.UWP/Globalization/ApplicationLanguages.iOS.cs

 using System.Collections.Generic;
 using System.Linq;
-using Foundation;
 
 namespace Windows.Globalization
 {
 	public static partial class ApplicationLanguages
 	{
-		public static IReadOnlyList<string> ManifestLanguages { get; } = NSBundle.MainBundle.PreferredLocalizations.Concat(NSBundle.MainBundle.Localizations).Distinct().ToArray();
+		public static IReadOnlyList<string> ManifestLanguages { get; } = GetManifestLanguages();
+
+		private static string[] GetManifestLanguages()
+		{
+			var manifestLanguages = global::Foundation.NSLocale.PreferredLanguages
+				.Concat(global::Foundation.NSBundle.MainBundle.PreferredLocalizations)
+				.Concat(global::Foundation.NSBundle.MainBundle.Localizations)
+				.Distinct()
+				.ToArray();
+
+			return manifestLanguages;
+		}
 	}
 }