https://www.reddit.com/r/Undertale/comments/3wp71g/the_undertale_public_license/cxy1bq6

WDTranslate.cs

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Text;
using System.Windows.Forms;

namespace WDTranslate
{
	class MainClass
	{
		static readonly string Text = "✋ \ud83d\udd48⚐\ud83d\udd46☹\ud83d\udc4e☠\ud83d\udd6f❄ ☼☜\ud83d\udc4d⚐\ud83d\udca3\ud83d\udca3☜☠\ud83d\udc4e ☹⚐⚐\ud83d\ude10✋☠☝ ❄☟☼⚐\ud83d\udd46☝☟ ❄☟☜ ☝✌\ud83d\udca3☜ ☞✋☹☜\ud83d\udca7\ud83d\udcea ✡⚐\ud83d\udd46 \ud83d\udc4e⚐☠\ud83d\udd6f❄ \ud83d\ude10☠⚐\ud83d\udd48 \ud83d\udd48☟✌❄ ✡⚐\ud83d\udd46 \ud83d\udca3✋☝☟❄ ☞✋☠\ud83d\udc4e\ud83d\udcec ✋❄ \ud83d\udc4d⚐\ud83d\udd46☹\ud83d\udc4e \ud83d\udc4c☜ \ud83d\udc4e☜✌\ud83d\udc4e☹✡\ud83d\udcec ❄☟☜☼☜\ud83d\udd6f\ud83d\udca7 ✌ ☼☜✌\ud83d\udca7⚐☠ ✋\ud83d\udd6f✞☜ \ud83d\udc4c☜☜☠ ☝\ud83d\udd46✌☼\ud83d\udc4e✋☠☝ ❄☟✋\ud83d\udca7 \ud83d\udca7☜\ud83d\udc4d☼☜❄ \ud83d\udd48✋❄☟ \ud83d\udca3✡ ☹✋☞☜\ud83d\udcec";

		static readonly string MyText = "I WAS REALLY BORED SO I MADE THIS TO TRANSLATE YOUR SPOOKY TEXT. COULDN'T FIND THE [Q] AND [Z] CHARACTERS IN YOUR COMMENTS, SADLY. I HAVE WAY TOO MUCH FREE TIME ...\n\nI'M NOT PERSONALLY INTERESTED IN DIGGING THROUGH THE GAME'S FILES MYSELF, THERE'S A SUBREDDIT THAT ALREADY DID THAT.";

		static readonly string[] Map = {
			"A", "✌",
			"B", "\ud83d\udc4c",
			"C", "\ud83d\udc4d",
			"D", "\ud83d\udc4e",
			"E", "☜",
			"F", "☞",
			"G", "☝",
			"H", "☟",
			"I", "✋",
			"J", "☺",
			"K", "\ud83d\ude10",
			"L", "☹",
			"M", "\ud83d\udca3",
			"N", "☠",
			"O", "⚐",
			"P", "\ud83c\udff1",
			//"Q", "?",
			"R", "☼",
			"S", "\ud83d\udca7",
			"T", "❄",
			"U", "\ud83d\udd46",
			"V", "✞",
			"W", "\ud83d\udd48",
			"Y", "✡",
			"X", "✠",
			//"Z", "?",
			",", "\ud83d\udcea",
			".", "\ud83d\udcec",
			"?", "✍",
			"!", "✏",
			"'", "\ud83d\udd6f",
			" ", " ",
			"\n", "\n",
		};

		static readonly Dictionary<char, string> MapTranslateTo = new Dictionary<char, string>();
		static readonly Dictionary<string, char> MapTranslateFrom = new Dictionary<string, char>();

		[STAThread]
		public static void Main(string[] args)
		{
			for (var i = 0; i < Map.Length; i += 2) {
				var chr = Map[i][0];
				var unicode = StringInfo.GetNextTextElement(Map[i + 1]);
				MapTranslateTo.Add(chr, unicode);
				MapTranslateFrom.Add(unicode, chr);
			}

			var sb = new StringBuilder();
			for (var e = StringInfo.GetTextElementEnumerator(Text); e.MoveNext(); ) {
				char chr;
				if (!MapTranslateFrom.TryGetValue((string)e.Current, out chr))
					chr = '?';
				sb.Append(chr);
			}
			Console.WriteLine(sb);

			sb = new StringBuilder();
			foreach (var chr in MyText) {
				string str;
				if (!MapTranslateTo.TryGetValue(chr, out str))
					str = "?";
				sb.Append(str);
			}
			Clipboard.SetText(sb.ToString());

			Console.ReadKey();
		}
	}
}