Dynamic property name

Dynamicpropertyname.cs

using System;
using System.Linq;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;

namespace ConsoleApplication3
{
    class Program
    {
        static void Main(string[] args)
        {
            var test = JsonConvert.DeserializeObject<TestClass>("{ \"Test_en\" : 1}");
        }
    }

    [JsonConverter(typeof(MyConverter))]
    class TestClass
    {
        public int Test { get; set; }
    }

    class MyConverter : JsonConverter
    {
        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
        {
            throw new NotImplementedException();
        }

        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
        {
            var jsonObject = JObject.Load(reader);

            var readedProperties = jsonObject.Properties().ToList();

            const string language = "en";

            var test = new TestClass();
            var propertiesInfo = test.GetType().GetProperties();

            foreach (var propertyInfo in propertiesInfo)
            {
                var type = propertyInfo.PropertyType;

                var firstOrDefault = readedProperties
                    .FirstOrDefault(x => x.Name == string.Format("{0}_{1}", propertyInfo.Name, language));

                if (firstOrDefault != null)
                {
                    var value = Convert.ChangeType(firstOrDefault.Value, type);
                    propertyInfo.SetValue(test, value);
                }
            }

            return test;
        }

        public override bool CanConvert(Type objectType)
        {
            throw new NotImplementedException();
        }
    }
}