JS datepicker libraries are loaded only for persian and islamic calendar, not for thai

The module is load js datepicker libraries only for persian and islamic calendar, not for thai (and others calendars). Therefore datapicker for thai calendar do not works.
The js datepicker libraries are adding in functions calendar_systems_load_js_date_picker_library() and calendar_systems_add_js_date_picker(). For quick fix you may just add all suported calendars in this functions:

function calendar_systems_load_js_date_picker_library() {
  if (module_exists('jquery_calendar')) {
    //Use the default settings configurable by date pickers' provider drupal module
    jquery_calendar_add(
-      'picker, picker.ext, persian, islamic'
+      'picker, picker.ext, persian, islamic, thai'
    );
  }
}

function calendar_systems_add_js_date_picker($css_class_id_type, $calendar_system = NULL, $language = NULL) {
.......
    $calendar_system_name_map = array(
      'arabic' => 'islamic',
      'iranian' => 'persian',
+      'thai' => 'thai',
      'gregorian' => 'gregorian',
    );
.......
}