title: How to check or activate SyntaxHighlight_GeSHi?
body: <p>During Mediawiki installation I checked the option for SyntaxHighlight, and it created a LocalSettings line,</p>
  
  <pre><code>   wfLoadExtension( 'SyntaxHighlight_GeSHi' );
  </code></pre>
  
  <p>so, I am supposed that it was installed... But no examples for <code>&lt;source lang&gt;</code> tag is running. For instance the <a href="https://www.mediawiki.org/wiki/Extension:SyntaxHighlight" rel="nofollow noreferrer">example of the Guide page</a>,<br/> <code>&lt;syntaxhighlight lang="Python" line='line'&gt; def quickSort(arr): ...&lt;/syntaxhighlight&gt;</code>  <br/>and its variations (with <code>&lt;source&gt;</code> tag) are not working.</p>
  
  <ul>
  <li>How to check if its alive?</li>
  <li>How to activate or to complete the installation?</li>
  </ul>