How to handle data in resource files programmatically?

Hi

I'm totally new at multilingual apps. I've applied this topic for multilingual core 2.1 mvc web app. successfully:

https://medium.com/swlh/step-by-step-tutorial-to-build-multi-cultural-asp-net-core-web-app-3fac9a960c43

But with creating and filling strings in resource files manually. But how to let the end-user to fill it by a form?

I searched a lot and thought I found the suitable topic:

https://docs.microsoft.com/en-us/dotnet/framework/resources/working-with-resx-files-programmatically

Am I right? or can you provide me other suitable topics please?