getOpenSubtitlesLanguage fail with es_ES

[juanpabloaj]

when I try this test

// lib/UtilsSpec.js
it('.getOpenSubtitlesLanguage() es_ES', function(done){

    var Utils = require('./Utils');

    var lang = Utils.getOpenSubtitlesLanguage('es_ES');
    expect(lang).to.be('spa');

    done();
});

and run

 $ mocha lib/UtilsSpec.js

  indexSpec
    ✓ .getOpenSubtitlesLanguage() (338ms)
    1) .getOpenSubtitlesLanguage() es_ES


  1 passing (353ms)
  1 failing

  1) indexSpec .getOpenSubtitlesLanguage() es_ES:
     Error: expected 'es_es' to equal 'spa'
      at Assertion.assert (node_modules/expect.js/index.js:96:13)
      at Assertion.be.Assertion.equal (node_modules/expect.js/index.js:216:10)
      at Assertion.(anonymous function) [as be] (node_modules/expect.js/index.js:69:24)
      at Context.<anonymous> (lib/UtilsSpec.js:32:25)
      at Context.<anonymous> (lib/UtilsSpec.js:9:9)