First of all, there is no "patch_v0120" inside ux0:app/PCSC00054 folder.
"patch_v0120" is in ux0/patch/PCSC00054/patch_v0120/
and copying the translated files in that folder will not start the game.
I put the "patch_v0120" folder with the translated files inside ux0:app/PCSC00054/
but now ux0/patch/PCSC00054/patch_v0120/ is missing those 3 files that i deleted,
- patch_v0120_cmn.eaf
- patch_v0120_jpn.eaf
- patch_v0120_rgn_japan.eaf
because of that, the game doesn't boot at all.
Since the op post is so old, probably the vita file structure is different from now. I'm using whatever the latest henkaku enso as of date.