Umbraco-CMS/src/Umbraco.Web.Common/ApplicationModels/BackOfficeIdentityCultureConvention.cs

using Microsoft.AspNetCore.Mvc.ApplicationModels;
using Umbraco.Cms.Web.Common.Filters;

namespace Umbraco.Cms.Web.Common.ApplicationModels
{

    // TODO: This should just exist in the back office project

    public class BackOfficeIdentityCultureConvention : IActionModelConvention
    {
        /// <inheritdoc/>
        public void Apply(ActionModel action) => action.Filters.Add(new BackOfficeCultureFilter());
    }
}