The PC version of Warriors Orochi Z was never officially released in the West. Community-made "common.arc" files replace the Japanese text with English.

common.arc typically refers to a primary archive file used in games developed by on the MT Framework engine, such as Resident Evil HD Remaster Resident Evil 5 Dragon's Dogma

However, before you click that first "Download" button on a random file-hosting site, you need to pause. Downloading single .arc files from unverified sources is a fast track to malware.

Replacing a missing or corrupted file that prevents a game from launching. Where to Find and Download common.arc Files Safely

Open the specific mod folder inside the riivolution directory on the root of your SD card.