The PAL version includes English text for menus and jutsu names, but the Japanese voice acting is intact. If you have the Japanese ISO, you need a translation patch (available via the Naruto Modding community on Discord). The PAL ISO is preferable for English speakers.
Because the game was never released in North America, the "ISO" (a digital backup of the game disc) is highly sought after by fans in that region who wish to play it via emulation (PC) or through modded PS2 hardware. naruto shipp%C5%ABden ultimate ninja 5 ps2 iso