I saw in the manual the galactic standard trade language.

I see "you", but not "I" / "me".

I see "good", but not "bad".

I see "neutral", but not "favorable"/"Approve", nor "unfavorable"/"against".

Are these words that don't exist, or are they just not listed in the manual's subset?

(I'd hate to try to translate, and get favorable and unfavorable mixed up. I can see "bad" being "no good", but that doesn't work for a three-way.)

Hmm...
"To improve commerce, a few of the major corporations collaborated in developing what is now known as Galactic Trade Standard - a language simple enough that it could be learned quickly, but diverse enough to cover anything that traders might want to say to one another.

What follows is a subset of Galactic Trade Standard that you will see while playing Vendetta. "

I would say that the words don't exist in the subset, mostly because they are not used in the signs that currently exist in the VO universe.

there is no bad in vendetta!