This code illustrates the incorrect and correct approaches to setting the culture in an ASP.NET Core application:
master branch shows the incorrect way of setting the culture (too late in the MVC pipeline, affects only the controller code)
alternate branch shows the proper way early in the MV pipeline which sets the culture for all downstream code, including views
See https://stackoverflow.com/questions/49382172/asp-net-mvc-async-currentculture-is-not-shared-between-controller-and-view for an explanation of the differences.