For those playing on original hardware (PSP/PS Vita), using the Google Translate app in "Lens" or "Camera" mode is a common, though slightly clunky, way to translate on-screen dialogue and menus.

Translating the Kenka Bancho games is notoriously difficult due to:

No active team is currently working on a full patch. The tools exist—we have better PSP ROM hacking utilities now than in 2010—but the willpower doesn’t. It’s a “labor of love” for a niche game within a niche genre on a dead console.