Just a suggestion to improve the website interface.
I noticed that the when adding labels to a workflow, the “Save” button doesn’t work if the label doesn’t conform to the format rule which I guessed includes “no space or underscore”. That’s in a workflow on “My Workflows” page, when clicking on “Manage labels”.
It would be clearer to add the rules somewhere, for example in the “New label…” text that appears when adding labels, or have an explicit message when clicking on the Save button. Right now nothing happens and it took me a minute to realize that there was a problem with my labels (spaces/underscores).