This feature is available in Enterprise and Ultimate editions.
Follow the instructions in this article to configure the menu options and label names in your instance of Lifecyle to use SAFe terminology.
To make changes on the Terminology page, your Admin Privileges role must be set to "System Administrator".
Go to Admin > Configuration > Terminology.
Click in the Label cell and type the new singular term, and change the following default Lifecycle terms to the equivalent SAFe terms:
Default Lifecycle Term
SAFe Equivalent Term
Press Tab key or click in the Plural Label cell, and update the plural terms accordingly.