docs: function updatePoFiles(filename, pattern) {
    var merged = [];
    var searchPath = path.dirname(filename);
  
    pattern = pattern || '*.po';
  
    glob.sync(pattern, {
      cwd: path.dirname(filename)
    }).forEach(function(file) {
      var poFile = path.join(searchPath, file);
      merged.push(mergeFiles(filename, poFile));
    });
  
    return Promise.all(merged);
  }