No such tool exists. If it did, every game ever would be translated.
There are *several* tools that, when used in conjunction with knowledge of reverse-engineering, debugging, the Japanese language, 65816 assembly, and frequently programming knowledge in other high-level languages to fill in any gaps, will help get the job done. But they all require a skilled operator at the helm and even a simple game like a beatemup typically requires dozens of hours of work.The Newbie Package of REQUIRED Material
Here's the standard beginnger's guide stuff:ROMHacking.net FAQ: You ask, we answer!ROMHacking.net Getting Started Section: Newbies Go HERE!ROMHacking.net Documents Section!How to ask questions the smart way.On the Essence of ROM HackingTalk with experienced people in our IRC chat and ask specific questions there.
Additionally, for SNES specifically, you'll need, at minimum:
A tile editor (I use yy-chr and Tile Layer Pro for most things but they don't cover every use case)
A hex editor (I use Windhex32)
A debugging-enabled emulator (I use Mesen S and Geiger's SNES9X)
A script extractor (I write my own, but you might have some luck with Cartographer)
A script inserter (I use Atlas)
A cross assembler (I use xkas)
A savestate viewer (VSNES)