https://www.whonix.org/wiki/Special:ReplaceText
? That is for mass search and replace.
Has to be used with great care since it can mess up a lot which can perhaps only be fixed with a database restoration from an unbroken revision (which then loses all other changes since last backup). Has a preview though before it actually changes things.
I doubt we are using the i2p gpg fingerprint on any other pages than on the i2p page?
A normal search shows the old fingerprint only on the i2p page. If we were to reuse the fingerprin (or verification instructions)t on multiple pages, we’d create a wiki template so still only one place has to be updated.