chore: More culture debugging stuff

Web/Pages/Public/About.razor

@@ -32,6 +32,16 @@
 </p>
 
 <h2>Culture info</h2>
+
+<p>Available cultures:</p>
+<select T="System.Globalization.CultureInfo" @bind="Culture" AnchorOrigin="Origin.BottomCenter">
+    @foreach (var culture in _supportedCultures)
+    {
+        <option Value="@culture">@culture.DisplayName</option>
+    }
+</select>
+<p>Amount test: @TestAmount.ToString("C", Culture)</p>
+
 <p>Current UI culture: @CultureInfo.CurrentUICulture.DisplayName</p>
 <p>Amount test: @TestAmount.ToString("C", CultureInfo.CurrentUICulture)</p>
 
@@ -40,6 +50,8 @@
     private IEnumerable<Claim> claims = Enumerable.Empty<Claim>();
 
     private decimal TestAmount = 123.56M;
+    private CultureInfo[] _supportedCultures = Array.Empty<CultureInfo>();
+    private CultureInfo Culture { get; set; }
 
     private string _version
     {
@@ -66,5 +78,11 @@
         {
             authMessage = "The user is NOT authenticated.";
         }
+
+        _supportedCultures = CultureInfo.GetCultures(CultureTypes.AllCultures & ~CultureTypes.NeutralCultures)
+        .Where(cul => !string.IsNullOrEmpty(cul.Name))
+        .ToArray();
+
+        Culture = CultureInfo.CurrentUICulture;
     }
 }