optimize startup

Oqtane.Server/Infrastructure/LocalizationManager.cs

@@ -45,6 +45,12 @@ namespace Oqtane.Infrastructure
         }
 
         public string[] GetInstalledCultures()
+        {
+            return GetSatelliteAssemblyCultures();
+        }
+
+        // method is static as it is called during startup
+        public static string[] GetSatelliteAssemblyCultures()
         {
             var cultures = new List<string>();
             foreach (var file in Directory.EnumerateFiles(Path.GetDirectoryName(Assembly.GetEntryAssembly().Location), $"*{Constants.SatelliteAssemblyExtension}", SearchOption.AllDirectories))