From the Order Lookup Dashboard, click Language Configuration
Select the base language you would like to work with, then click Load
This will populate the text fields with text based on the language you selected. The fields on the left are the default text for the language you chose. Use the fields on the right to adjust or translate the text into anything you want. This is a great place to make Order Lookup unique to your store.
Be sure to press the Save button before leaving the page.