code: function (domain, poString, callback) {
          var icuObject = this.poStringToICUSync(domain, poString);
          callback(null, icuObject);
      }
docs: /*
  Parses a string representation of a po file into a JSON object asynchronously.
  The JSON object has the following structure:
  {
  [msgid in ICU format]: [msgstr in ICU format],
  .
  .
  .
  }
  Callback takes two arguments – error and the json object