Add the ability to customize both the content and the subject of email notifications sent by Mantra.

When the workflow contains multiple steps performed in Language Cloud by the same assignee, the email notifications received are all basically identical.
Having customized email notifications would allow the recipient to disambiguate between workflow steps and make the context clear for external stakeholders such as client reviewers.

These email notifications could be customizable depending on a range of criteria, such as the workflow step or whether the task has been Rejected at the following step and sent back to the previous step, etc.