title: Is there a way to transform language to locale?
body: <p>I was wondering if there is a simple way in python to transfer pycountry.language.alpha2 strings like 'en', 'de', 'cs'... to locales i.e. strings like 'en_US', 'de_DE', 'cs_CZ' and so on. </p>
  
  <p>Even wonder if there exists a unambiguous translation.</p>
  
  <p>To be more specific I need this, because we store language in ISO639-1 format but netsuite rest api requires locale and they somehow determine language of invoice by that...</p>