title: Get [Messages] values in InnoSetup's language file
body: <p>I know I can easily get messages inside</p>
  
  <pre><code>[CustomMessages]
  AdditionalIcons=blablabla
  </code></pre>
  
  <p>using this code:</p>
  
  <pre><code>ExpandConstant('{cm:AdditionalIcons}');
  </code></pre>
  
  <p>which gets the <code>AdditionalIcons</code> string message. However, how can I get messages inside this?</p>
  
  <pre><code>[Messages]
  ButtonNext=huhu
  ButtonInstall=bubu
  </code></pre>
  
  <p>What I need is to get the <code>ButtonNext</code>, <code>ButtonInstall</code> and other values, and it is NOT possible to get those values using code like this:</p>
  
  <pre><code>ExpandConstant('{cm:ButtonNext}');
  </code></pre>
  
  <p>How can I query those values?</p>
  
  <h2>Related links</h2>
  
  <p><a href="http://www.mirality.co.nz/inno/tips.php" rel="nofollow noreferrer">Inno Setup Script tips</a></p>