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Billing.Shared/Languages/PlatformCulture.cs

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+namespace Billing.Languages
+{
+    public partial class PlatformCulture
+    {
+        public string PlatformString { get; set; }
+        public string LanguageCode { get; set; }
+        public string LocaleCode { get; set; }
+
+        public string Language => string.IsNullOrEmpty(LocaleCode) ? LanguageCode : LanguageCode + "-" + LocaleCode;
+
+        public partial string GetNamespace();
+        public partial void Init();
+
+        public PlatformCulture()
+        {
+            Init();
+        }
+
+        private void Init(string cultureString) 
+        {
+            if (string.IsNullOrEmpty(cultureString))
+            {
+                cultureString = "zh-CN";
+            }
+
+            PlatformString = cultureString.Replace('_', '-');
+            if (PlatformString.Contains('-'))
+            {
+                var parts = PlatformString.Split('-');
+                LanguageCode = parts[0];
+                LocaleCode = parts[^1];
+            }
+            else
+            {
+                LanguageCode = PlatformString;
+                LocaleCode = string.Empty;
+            }
+        }
+
+        private string ToDotnetFallbackLanguage()
+        {
+            string netLanguage = LanguageCode switch
+            {
+                // fallback to Portuguese (Portugal)
+                "pt" => "pt-PT",
+                // equivalent to German (Switzerland) for this app
+                "gsw" => "de-CH",
+
+                // add more application-specific cases here (if required)
+                // ONLY use cultures that have been tested and known to work
+
+                // use the first part of the identifier (two chars, usually);
+                _ => LanguageCode,
+            };
+            Helper.Debug($".NET Fallback Language/Locale: {LanguageCode} to {netLanguage} (application-specific)");
+            return netLanguage;
+        }
+
+        public override string ToString() => PlatformString;
+    }
+}