add new method for getting neutral cultures

Oqtane.Client/Modules/Admin/Site/Index.razor

@@ -721,7 +721,7 @@
             if (site != null)
             {
                 _timezones = TimeZoneService.GetTimeZones();
-                _cultures = await LocalizationService.GetCulturesAsync(false);
+                _cultures = await LocalizationService.GetNeutralCulturesAsync();
                 var settings = await SettingService.GetSiteSettingsAsync(site.SiteId);
 
                 _pages = await PageService.GetPagesAsync(PageState.Site.SiteId);

Oqtane.Client/Services/LocalizationService.cs

@@ -1,5 +1,4 @@
 using System.Collections.Generic;
-using System.Linq;
 using System.Net.Http;
 using System.Threading.Tasks;
 using Oqtane.Documentation;
@@ -14,10 +13,16 @@ namespace Oqtane.Services
     public interface ILocalizationService
     {
         /// <summary>
-        /// Returns a collection of supported cultures
+        /// Returns a collection of supported or installed cultures
         /// </summary>
         /// <returns></returns>
         Task<IEnumerable<Culture>> GetCulturesAsync(bool installed);
+
+        /// <summary>
+        /// Returns a collection of neutral cultures
+        /// </summary>
+        /// <returns></returns>
+        Task<IEnumerable<Culture>> GetNeutralCulturesAsync();
     }
 
     [PrivateApi("Don't show in the documentation, as everything should use the Interface")]
@@ -31,5 +36,10 @@ namespace Oqtane.Services
         {
             return await GetJsonAsync<IEnumerable<Culture>>($"{Apiurl}?installed={installed}");
         }
+
+        public async Task<IEnumerable<Culture>> GetNeutralCulturesAsync()
+        {
+            return await GetJsonAsync<IEnumerable<Culture>>($"{Apiurl}/neutral");
+        }
     }
 }