Missing translation keys when stopping an active workflow

[stefanosgeo]

Steps to Reproduce

1. Upload a video and start a workflow.
2. While the event is in running status, navigate to the Event > Workflows tab and click the Stop button.

The red warning message appears when attempting to stop the workflow on the duplicated event.
Duplicate the event and repeat step 2 to stop the workflow again.

[stefanosgeo]

I will try to make a PR to fix this