JSCalendar is part of the JSTools module.
The Date Popup module is part of the the Date module.
- Please check if cron is running correctly if scheduler does not publish your scheduled nodes.
- Scheduler does only schedule publishing and unpublishing of nodes. If you want to schedule any other activity check out Workflow, Rules and Actions.
Translations to other languages than English can be found over there: http://localize.drupal.org/translate/projects/scheduler
Heather James has recorded a nice tutorial screencast about publishing nodes with scheduler: http://www.youtube.com/watch?v=G7VfhGI4aoE