Error in date_month_names function

The array returned by this function is always blank which makes months unselectable in data popups.

This is because:

    foreach (date_month_names_translated() as $key => $month) {
      $month_names[$key] = $month_name;
    }

Should be:

    foreach (date_month_names_translated() as $key => $month) {
      $month_names[$key] = $month;
    }