Short Answer: No.
Long Answer: Even if you find the archived .rpf translation files on an old Reddit post or a dead MEGA link, you cannot play Monster Hunter Frontier Z in any language on the PS Vita because the official servers are offline.
However, there are two caveats to this "no."
If PC has a perfect private server, why mourn the Vita patch?
Short answer: No.
Longer answer: There is a caveat, but it’s not the Vita.
Short Answer: No.
Long Answer: Even if you find the archived .rpf translation files on an old Reddit post or a dead MEGA link, you cannot play Monster Hunter Frontier Z in any language on the PS Vita because the official servers are offline.
However, there are two caveats to this "no."
If PC has a perfect private server, why mourn the Vita patch?
Short answer: No.
Longer answer: There is a caveat, but it’s not the Vita.