Flavor text, some armor descriptions, and deep NPC dialogue may still appear in Japanese as translators prioritize functional gameplay data.
Playing Frontier Z on the Vita is a unique experience, but it comes with hardware caveats. Performance
Summary
Acquire the latest patch files from the community's repository or Discord server.
Modify the game's hosts file or use a dedicated homebrew plugin to point the console toward your chosen private server.
Since official servers are offline, your Vita must be configured to connect to a community-hosted private server (such as RainServer) to get past the title screen. How to Install the MHFZ PS Vita English Patch
In short, the patch turned a Japanese MMO into a functional English menu simulator. You could hunt, carve, and craft. You could not enjoy the lore or the complex endgame gearing without a second screen open to a wiki.