message: Updated index.html
  Changed position of link to JP version.
  Also fixed all "plugin" notations to "plug-in".
  Also fixed some English.
diff: <html>
  <head>
  <meta charset="utf-8">
  - <title>Package your kintone plugin!</title>
  + <title>Package your kintone plug-in!</title>
  <link rel="stylesheet" href="./dist/normalize.min.css">
  <link rel="stylesheet" href="./css/style.css">
  <script src="./dist/bundle.min.js" defer></script>
  <!-- <script src="./dist/bundle.js" defer></script> -->
  </head>
  <body>
  - <h1>Package your kintone plugin!</h1>
  + <h1>Package your kintone plug-in!</h1>
  <div id=input>
  - <p><a href="./index-ja.html">In Japanese</a></p>
  - <p>Please zip the plugin file and attach it.<br>
  - It will generate the secret key file and a signed plug-in file.<br>
  - From the second time, please also attach the secret key file.</p>
  + <p>Upload the zipped plug-in file.</ br>
  + A secret key file and a signed plug-in file will be generated.</ br>
  + The secret key will also need to be uploaded when repackaging your plug-in.</p>
  <ul>
  <li>Zip file: <input type=file class=contents></li>
  <li>Secret key file (optional): <input type=file class=ppk></li>
  </div>
  <div id=output class="hide">
  - <h2>Packaging plugin is completed.</h2>
  + <h2>Packaging plug-in is completed.</h2>
  <ul>
  <li>ID: <span class=id></span></li>
  <li><a class=plugin download=plugin.zip>plugin.zip</a></li>
  <h2>Error</h2>
  <ul class=messages></ul>
  </div>
  -
  + <p>Lang: <a href="./index-ja.html">JP</a></p>
  </body>
  </html>
  