I am trying to add "Estimated" to the Shipping and Handling on my check out. I cannot find the location for the life of me. See screenshot. This is on the final check out and also in the cart.
If you go to app\locale\en_US then modify Mage_Sales.csv
Search the CSV for "Shipping & Handling" and change the next field over that says the same to "Estimated Shipping & Handling". The idea here is the CSV the field on the left is the text to be translated then the field on the right is the translation.