Google translate c#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net.Http;

namespace Requester
{
    enum Language
    {
        Auto,
        French,
        English,
        Japanese
    }
    class Translator
    {
        static string url = @"https://translate.google.com/_/TranslateWebserverUi/data/batchexecute?rpcids=MkEWBc&f.sid=4993954143505568433&bl=boq_translate-webserver_20201221.17_p0&hl=fr&soc-app=1&soc-platform=1&soc-device=1&_reqid=700690&rt=c";

        Language src;
        Language dst;
        public Translator(Language src, Language dst)
        {
            this.src = src;
            this.dst = dst;
        }
        public string Translate(string toTranslate)
        {
            string translatedString;

            Dictionary<string, string> parameters = new Dictionary<string, string>();

            parameters.Add("f.req", $"[[[\"MkEWBc\",\"[[\\\"{toTranslate}\\\",\\\"{ParseLanguage(src)}\\\",\\\"{ParseLanguage(dst)}\\\",true],[null]]\", null, \"generic\"]]]");
            //parameters.Add("at", "AD08yZna3jZ2xQRbOG4dFZokrfl9:1608937889401");

            using (HttpClient client = new HttpClient())
            {
                FormUrlEncodedContent encodedParameters = new FormUrlEncodedContent(parameters);
                Task<HttpResponseMessage> responseMessage = client.PostAsync(Translator.url, encodedParameters);
                translatedString = ParseOutput(responseMessage.Result.Content.ReadAsStringAsync().Result);
            }

            return translatedString;
        }
        public string ParseOutput(string output)
        {
            int start = output.IndexOf(",[\\\"");

            string parseOutput = output.Substring(start + 4, output.Length - start - 4);

            string result = String.Empty;

            foreach(char c in parseOutput)
            {
                if (c == '\\')
                    break;
                result += c;
            }

            return result;
        }
        public string ParseLanguage(Language language)
        {
            switch(language)
            {
                case Language.French:
                    return "fr";
                case Language.English:
                    return "en";
                case Language.Japanese:
                    return "jp";
                default:
                    return "auto";
            }
        }
    }
}