User blog comment:12th Supernova/Chapter 778: A King's Resolve, A Pirate's Attack/@comment-1595565-20150226172436/@comment-26082375-20150226190555

At the end of 777 when Zoro comes up with "Plan E," the speech bubble in the Japanese raw said "sakusen 5" which would be "plan/tactic 5." The title of chapter 778 is written in English, "Tactics No. 5." I'm not sure about the ending bit saying "Tactics 5 accomplished," but point being "Plan E" was probably a localization by Mangastream.

Not sure how reliable it is, but the Chinese raw of 778 uses the same characters as "sakusen 5" at the end of the chapter for the "Tactics 5 accomplished" thing.