When using a dynamic workflow with more than one target language, the final step being used is grey and reads "This task is displyed in more than one list".
The Final Step of a Dynamic Workflow, while appearing in all (this number is dependent on how many target languages are in the project) of the workflows is really the same task. For example, any change to that final step or if it is completed in one language would also get applied or completed in the other ones as well.
This is the reason for the message, "The task is displayed in more than one list." appears when using a "Final Step" in a dynamic workflow.