At present (12/2010) the JobScheduler is able to accept all Unicode characters in the scheduler log.
E.g, if your script or program put some unicode-characters to stdout or stderr, this will be shown correctly.
All other text,
- error-, warning and info messages,
- GUI-text,
- log-file entries,
- help- and tooltip-texts
- ...
are in english and german only.
One major topic on the road-map of JobScheduler is the translation of all these texts.