It should be possible to have workflow-objects in multiple languages:
workflow task descriptions
text of workflow-tasks
text of e-mails
At the moment a workflow can only be defined in one language. German umlauts(for example) are not supported in task-descriptions.
If a company has a location in US, China and Russia - and they are using the promotion request or a change request across this sites - it would be helpfull if the language of the workflow-tasks and e-mails can be different.
The required language can be identified by the preference in the participant administrator.