http://bugs.winehq.org/show_bug.cgi?id=29928
--- Comment #2 from Lauri Kenttä lauri.kentta@gmail.com 2012-06-25 14:42:09 CDT --- (In reply to comment #1)
Are they used anywhere in Wine's UI?
Yes, they're used in Wine Control Panel / Internet Settings / Security. They're initialized when the prefix is created, so you'll have to create a clean prefix after changing and recompiling to see the changes.
(In reply to comment #1)
Does Windows have localized strings in the same place?
The texts are there, but I think Windows doesn't really use them.