title: Include files in scala i18n internationalization
body: <p>I was wondering if there is any way to include references to other files in the scala messages files for internationalization (i18n).</p>
  
  <p>Our messages files are getting pretty big and it's a pain to work with them. So I was wondering if there is some kind of import or something that can be made. Like <code>import somefile.en-US</code></p>
  
  <p>Thank you in advance.</p>