old_contents: // ==UserScript==
  // @name        WaniKani: I Don't know button
  // @namespace   wk-wakaran
  // @version     1.0
  // @author Niklas Barsk
  // @description Adds an "I don't know the answer" button to reviews. When clicked it will submit an incorrect answer.
  // @include     https://www.wanikani.com/review/session*
  // @run-at      document-end
  // @updateURL https://raw.githubusercontent.com/nibarius/wk-wakaran/master/wk-wakaran.user.js
  // ==/UserScript==
  
  function onDontKnowClick(e) {
      if (isMeaning()) {
      	document.getElementById("user-response").value="I have no clue T_T";
      }
      else {
          document.getElementById("user-response").value="えぇぇ！。。。さっぱりわからないぃぃぃ。・ﾟﾟ･（≧д≦）･ﾟﾟ･｡";
      }
  }
  
  function isMeaning() {
      return document.getElementById("question-type").className == "meaning";
  }
  
  function addDontKnowButton() {
    	var dontKnowButton = document.createElement("b");
    	dontKnowButton.innerHTML = "?";
    	dontKnowButton.setAttribute("style", "margin-left: 0.5em");
      dontKnowButton.onclick = onDontKnowClick;
    	document.getElementById("answer-form").getElementsByTagName("button")[0].appendChild(dontKnowButton);
  }
  
  addDontKnowButton();
  
new_contents: // ==UserScript==
  // @name        WaniKani: I Don't know button
  // @namespace   wk-wakaran
  // @version     1.0
  // @author Niklas Barsk
  // @description Adds an "I don't know the answer" button to reviews. When clicked it will submit an incorrect answer.
  // @include     https://www.wanikani.com/review/session*
  // @run-at      document-end
  // @updateURL https://raw.githubusercontent.com/nibarius/wk-wakaran/master/wk-wakaran.user.js
  // ==/UserScript==
  
  function onDontKnowClick(e) {
      if (isMeaning()) {
          document.getElementById("user-response").value="Aargh! What does that even mean? (╯°□°)╯︵ ┻━┻";
      }
      else {
          document.getElementById("user-response").value="えぇぇ！。。。さっぱりわからないぃぃぃ。・ﾟﾟ･（≧д≦）･ﾟﾟ･｡";
      }
  }
  
  function isMeaning() {
      return document.getElementById("question-type").className == "meaning";
  }
  
  function addDontKnowButton() {
    	var dontKnowButton = document.createElement("b");
    	dontKnowButton.innerHTML = "?";
    	dontKnowButton.setAttribute("style", "margin-left: 0.5em");
      dontKnowButton.onclick = onDontKnowClick;
    	document.getElementById("answer-form").getElementsByTagName("button")[0].appendChild(dontKnowButton);
  }
  
  addDontKnowButton();
  
subject: Improve English message.