You can save for export and then use "Find in files" with the html editor or something like notepad++ to find where the text is and then just edit it to say what you need.
You can also do a Find/Replace in files to do it too.. I like knowing the line numbers and the files for reference.. Just me, control freak..
Just remember anytime you do a custom edit, you have to do it again each time you save the store after changes...
(In my saved for server files,, yours may be a little different line numbers)
--Shipping Total--
ccdata\data\cart.inc.php (line 410)
ccdata\data\cart_authnet_1.inc.php (line 410)
ccdata\data\cart_pp_1.inc.php (line 410)
ccdata\data\cart_pp_2.inc.php (line 409)
--Estimated Taxes--
ccdata\data\cart.inc.php (line 425)
ccdata\data\cart_authnet_1.inc.php (line 425)
ccdata\data\cart_pp_1.inc.php (line 425)
ccdata\data\cart_pp_2.inc.php (line 425)
I keep a file with all my custom edits in it so I can do it easy each time I do some changes.