User experience improvements

Oqtane.Server/Infrastructure/LocalizationManager.cs

@@ -1,4 +1,6 @@
-using System.Collections;
+using System.Collections.Generic;
+using System.IO;
+using System.Reflection;
 using Microsoft.Extensions.Options;
 using Oqtane.Shared;
 
@@ -22,8 +24,23 @@ namespace Oqtane.Infrastructure
                 : _localizationOptions.DefaultCulture;
 
         public string[] GetSupportedCultures()
-            => _localizationOptions.SupportedCultures.IsNullOrEmpty()
-                ? SupportedCultures
-                : _localizationOptions.SupportedCultures;
+        { 
+            List<string> cultures = new List<string>();
+            foreach(var file in Directory.EnumerateFiles(Path.GetDirectoryName(Assembly.GetEntryAssembly().Location), "*.resources.dll", SearchOption.AllDirectories))
+            {
+                if (!cultures.Contains(Path.GetFileName(Path.GetDirectoryName(file))))
+                {
+                    cultures.Add(Path.GetFileName(Path.GetDirectoryName(file)));
+                }
+            }
+            if (cultures.Count == 0)
+            {
+                return SupportedCultures;
+            }
+            else
+            {
+                return cultures.ToArray();
+            }
+        }
     }
 }