title: Zend Framework 2 translate using gettext a text with variables
body: <p>How I have to do for translate a string as this, where $user contains the user name?</p>
  
  <pre><code>    $message = 'Hello ' . $user . ', how are you';
  </code></pre>
  
  <p>If I translate using the follow code, it don't works.</p>
  
  <pre><code>    $message = $translator-&gt;translate('Hello ' . $user . ', how are you');
  </code></pre>
  
  <p>In my en_EN.po file I have:</p>
  
  <pre><code>    msgid "Hello %s, how are you"
      msgstr ""
  </code></pre>
  
  <p>In my es_ES.po file I have:</p>
  
  <pre><code>    msgid "Hello %s, how are you"
      msgstr "Hola %s, como estas"
  </code></pre>
  
  <p>Thanks in advance.</p>