There is no Save button for description on the workflow page. I mistakenly deleted our description template.
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On most of our text editors, there is a "History" button which allows you to access previous versions of the information in your descriptions. You can then revert to any previous version so that you don't need to worry about accidentally deleting information.
With this capability in mind, we don't have plans to add a Save button, but hope that this should help.