You say that this appears in Recent Activity, but both the "Recent Activity" sidebar block and XenForo's Members > "Recent Activity" news feed already use the "User created a WIKI-TYPE-NAME" format that you suggested.
The only places that I know of that use the "created this node" phrase vw_history_change_created are the History tab, Special:Contributions, and Special:RecentChanges.
I have updated this phrase in the next release so that it uses the name of the content-type in place of the word "node". For areas, that's "created this area"; for books, "created this book"; for templates, "created this template"; etc.