As for voice dialogue: well it depends how high pirate factor you want!
"There is booty to be had lads"--- there is stuff/loot to be had guys.
"Argh"--- typical pirate phrase after or before another sentence, but can also stand alone
"Aye aye captain" ----
"me and me scallywags be ready captain" ----me and my vilainious bunch are ready captain
"ahoy"---- hallo
"ahoy ye landlubbers" ----hallo you land based sod.
"Raise the jolly roger(lads)" ---raise the pirate flag
"shiver me timbers" ---holy crap
"no prey no pay"---- sais itself, must raid.. must.. RAID
"aye aye ye scurvy dog" ---yes yes you prolific pirate
"Ahoy Matey!" ----hallo friend
"ahoy me hearties!" ----hallo my friends
"Avast ye (sod)"---- pay attention to this (you sod)
"Batten down the hatches" -----tie everything down, a storm is coming
"heave ho" ----give it some muscle and push it.
"yo ho ho" -----cheerful exhortation to demand attention
"Bilge sucking ... ---- <nasty word>" insult
"Blimey" -----exhortation of surprise"
"dead men dont bite" -- ---- kill em all
"Bring me one noggin of rum, now, won't you matey"--- bring me a drink, wont you friend.
""Fifteen men on a dead man's chest — Yo-ho-ho, and a bottle of rum!" --- good ol pirate saying
"hold yer horses ye landlubber" chill, you land based man
"prepare to be boarded"
Ive never really looked into sins voices, do each ship just have 1 or is it 2 sentences?
Would need to tailor each sentence to each ship according to its role, example: there is booty ahead lads wont fit a diplomatic vessel -well maybe if its indirectly but still.
What kind of dialogue do you want Zombie? High pirate factor or low, and do you want it clean cut or mixed in with future stuff like
"heave ho, ye space rats", "ahoy captain, me spaceship is at yer command" "ahrr, more power to the plasma reactor ye scallywags" etc or instead of landlubbers it could be planetlubbers, hehe
Just need some feedback from you regarding what sort of dialogue types you want.