title: postgres - cannot create collation
body: <p>I have a postgres 9.2 database running on debian wheezy. If I execute in pgadmin: </p>
  
  <pre><code>CREATE COLLATION en ( LOCALE = 'en_US.UTF-8')
  </code></pre>
  
  <p>I get the following error message.</p>
  
  <pre><code>ERROR:  could not create locale "en_US.UTF-8": Datei oder Verzeichnis nicht gefunden
  DETAIL:  The operating system could not find any locale data for the locale name "en_US.UTF-8".
  </code></pre>
  
  <p>I already configured locals on that machine and restarted postgres:</p>
  
  <pre><code>locale-gen en_US.UTF-8
  Generating locales (this might take a while)...
    de_DE.UTF-8... done
    en_US.UTF-8... done
    fr_FR.UTF-8... done
    tr_TR.UTF-8... done
  </code></pre>
  
  <p>But the error is still there. Is there anything else I need to check? </p>