title: Contributing to JHipster
body: <p>I would contribute to the JHipster project adding catalan properties for i18n. However, my IDE prevents me from doing so when I try to import a project because there is no pom.xml (there is a _pom.xml).
  I don't understand why an underscore was added to the pom.xml filename. Does someone know the reason?</p>
  
  <p><strong>Updated:</strong></p>
  
  <p>I guess it's because it's not a Maven Java project. So where I can find documentation about how to compile and test my changes?</p>