OK, so searching for "Page_" didn't work very well. It returned about 1,000 hits and even after checking and changing every one that made any sense, my problem still existed.

So I found another solution:
1) Change the names in 'english.php' (in your template override) so that the labels show up correctly in the 'more_information.php' module.

2) Edit the contents of Page 2, Page 3, etc. using Admin/Tools/Define Pages Editor. I put my page title in an HTML comment so that I'd know in the future what I was editing -- e.g., <!-- My Title -->

3) Copy 'tpl_page2_default.php' and the two other default files to /my_template/templates/.

4) Open 'tpl_page2_default.php' in a text editor and replace
Code:
<?php echo HEADING_TITLE; ?>
with
Code:
<?php echo BOX_INFORMATION_PAGE_2; ?>
5) Repeat step 4 for each of the define pages, changing the page number in the code, then upload these (and the english.php file) to your server.


For the future, it would be great if this feature was integrated into the Admin panel, as well as the ability to add new pages.

HTH,
Tim