Edit Stock Statuses
System > Localization > Stock Statuses
Stock Status Name: The wording you want to display.
A stock status is the status that will be displayed when a product runs out. You can assign a stock status to individual products. You might want to assign a stock status of 1 - 2 days if you have stock for a particular product arriving in the next 1 - 2 days.
After you have made your changes, click the save button