title: lupdate doesn't create .ts translations file
body: <p>So, i've ran into a problem. When i use lupdate on Qt Creator (Tools -> External -> Linguist -> Update Translations (lupdate))  the translations files aren't created.</p>
  
  <p>I've added the "TRANSLATIONS +=" on the .pro file</p>
  
  <pre><code>TRANSLATIONS    +=  localization/localization_es.ts
  </code></pre>
  
  <p>But still the translations files aren't created. localization/ path exist on the project folder, but still, no files are created.</p>