Having done quite a bit with JP.. theres a few things you mentioned should be removed, but they actually do get used.
The O and X are actually used to indicate yes (O) and no (X) to JP
Keyboard:
This whole category.
<Log><Please check it> (Log means chat log not log of wood afaik)
<Enemy><Physical><Attack><Take care> (take care actually translates into "be careful" in JP.. not "see you later")
<Mercenary rank><What?>
<Sword><Skill><Level><What?>
<Treasure><You can have this>
This is quite ambiguous... I have had many cases where I thought someone was buying something but instead wanted to sell to me ><
Fishing routes
A few that should stay: Artifact, armor, earring, racial gear (RSE), Ring
