Add a note about configuring Blazor Wasm culture using JavaScript (#20231)

Author: pranavkm

aspnetcore/blazor/globalization-localization.md

@@ -68,6 +68,19 @@ By default, Blazor WebAssembly carries minimal globalization resources required
 </PropertyGroup>
 ```
 
+Blazor WebAssembly can also be configured to launch using a specific application culture using options passed to `Blazor.start`. For instance, the sample below shows an app configured to launch using the `en-GB` culture:
+
+```html
+<script src="_framework/blazor.webassembly.js" autostart="false"></script>
+<script>
+  Blazor.start({
+    applicationCulture: 'en-GB'
+  });
+</script>
+```
+
+The value for `applicationCulture` should conform to the [BCP-47 language tag format](https://tools.ietf.org/html/bcp47).
+
 If the app doesn't require localization, you may configure the app to support the invariant culture, which is based on the `en-US` culture:
 
 ```xml