title: Unescaping HTML entities (&#nnnn;) into plain UTF-8
body: <p>We have HTML source files which contain special characters encoded as <code>&amp;#nnnn;</code> like in the word:</p>
  
  <p><code>au&amp;#223;ergew&amp;#246;hnlich</code></p>
  
  <p>We would like to convert them into plain UTF-8:</p>
  
  <blockquote>
    <p>au&#223;ergew&#246;hnlich</p>
  </blockquote>
  
  <p>Is there any small tool to do that?</p>