The fan community has stepped up. By searching for "Tokyo Ghoul Jail English story" or "Tokyo Ghoul Jail Full Game Walkthrough English Commentary" on YouTube, you can find players who have navigated the game and provide real-time translations of the dialogue and story events. While these aren't "patches" that alter the game files, they serve as a perfectly functional let's play that translates the experience in real time.
When the game launched in October 2015, it was met with immediate interest from international fans. However, Bandai Namco chose not to localize the game for Western markets, largely due to the niche status of the PlayStation Vita outside of Japan at the time. Tokyo Ghoul Jail English Translation