No, there was a English translation done by Nintendo, no matter if there was barely any text in-game (Many of the Kirby games only had text for menus and ability description, so that's no change =P). There never WAS a European version, if I had to clear that out. And there was like only one game released with that copyright chip, and that was some Super Deformed Gundam game.
The coprocessor allows the game console to process data faster. IE, it was used to help with it's graphic effects since this was the only game on the console which used dithered sprites.
Here are comparison shots,
English:
Japanese:
I have no idea what version of the game that you have, but other than the Nintendo logo, title screen, and perhaps the credits, everything else was written in English text in the Japanese version.