Update sign.html

Author: metsma

demo/sign.html

@@ -200,6 +200,7 @@ <h1>sign()</h1>
      <input type="radio" name="lang" value="ru">русский
      <input type="radio" name="lang" value="lt">lietuviešu
      <input type="radio" name="lang" value="lv">latvijas
+     <input type="radio" name="lang" value="fi">suomi
      <input type="radio" name="lang" value="sw">Swahili
    </li>
    <li><b>BACKEND</b>: