This feature is available in Enterprise and Ultimate editions.
Because terminology (Scrum, XP, DDSM, etc.) varies across the industry, you can configure Lifecycle to use the terms specific to your organization. This article explains how to customize (or localize) the the terms used for assets throughout the system.
Where to Find Asset Labels
Asset labels are primarily found in buttons (Add Story, Add Issue). However, they may also appear as titles on grids and on details pages.
To make changes on the Terminology page, your Admin Privileges role must be set to "System Administrator".
Select Admin > System Configuration > Configuration > Terminology.
For each term you want to change, click in the Label cell and type the new singular term.
Press Tab key or click in the Plural Label cell, and update the new plural term.