Sure, just take a backup of the original files so you can fix it if things go south, which they may. Editing the html files may not cause disruptions - but editing the actual .rb files may have unexpected consequences to the people who have active PUNs with the old files. So while you’re doing the work - I’d suggest you put OOD in maintenance mode or similar and restart everyone’s PUNs afterwards.
Here is the patch. You don’t need the test case update, just the updates in the other 2 files.
I just filed a bug for that. I’ll see what I can do for the 3.1 release cycle.