Use Interop

Oqtane.Server/Pages/_Host.cshtml

@@ -1,4 +1,4 @@
-@page "/"
+@page "/"
 @namespace Oqtane.Pages
 @addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers
 @using System.Globalization
@@ -48,12 +48,6 @@
     @if (Configuration.GetSection("Runtime").Value == "WebAssembly")
     {
         <script src="_framework/blazor.webassembly.js"></script>
-        <script>
-            window.oqtaneCulture = {
-                get: () => window.localStorage['OqtaneCulture'],
-                set: (value) => window.localStorage['OqtaneCulture'] = value
-            };
-        </script>
     }
     else
     {