Radzen is using Angular i18n which works only when the app was build in production mode - Radzen run button will run the app in debug mode. You can deploy your app to your local IIS to check the localization.
To build localized version of the application is far more complex compared to non localized version. For each language you should have separate Angular application + there is a special code in the .NET Core app to handle localization. Of course all these are implemented out-of-the-box when you deploy the app using Radzen.
Thanks for your reply. But I still get the same error. I following the quick video (https://www.radzen.com/documentation/internationalization/) to deploy it. It does not configure any ".NET Core app" on the video. The only difference is that I deploy it as "zip" file. My web server is Apache and Nginx.
I unzip the file (deploy.zip) into my web server.
I connect to my English language version. If I try to switch to "Traditional Chinese", I still get the same error.
Does anyone have the detail procedure to configure it correctly ? I need the detail information or tutorial to solve this issue.