You can override the default terminology for a number objects and phrases in the application. Make sure when changing the terminology that you specify both singular and plural versions to avoid confusion.
The terminology you enter should be appropriate for the default language of your system (as configured on the System > General page). You can provide translations for up to 4 additional languages by clicking the globe icon next to each terminology row. Users will see the appropriate translation based on the Locale setting in their employee profile (as configured in their employee record on the Employees tab).