I can translate the Dutch voice clips from the following video, but I don't know the in-game translations or anything. Maybe it helps.
Agenda approval:
Dutch: Nederland floreert met elke zending die u ons stuurt.
Translation: The Netherlands flourishes with every shipment you send to us.
Attacked:
Dutch: Uw verraderlijke agressie zal geen succes kennen! Nederland houdt stand!
Translation: Your treacherous aggression will not succeed! The Netherlands will hold!
(NOTE: A more literal translation would be: "Your treacherous agression will know no success." Not sure if that's a common thing to say in English.)
Declares war:
Dutch: Nederland is onbevreesd voor u! Wanneer wij u verslaan, zijn wij sterker dan ooit!
Translation: The Netherlands is undaunted by you! When we defeat you, we'll be stronger than ever!
First meeting:
Dutch: Ik ben Wilhelmina, koningin der Nederlanden. Het is mij 'n grote eer u eindelijk te ontmoeten.
Translation: I am Wilhelmina, queen of the Netherlands. It is a great honour for me to finally meet you.
Defeated:
Dutch: Moge Nederland, met God's hulp, op een dag zijn grondgebied terugwinnen.
Translation: May the Netherlands, with God's help, reclaim his territory one day.
Pep talk:
Dutch: Hoe donker en moeilijk deze tijden ook zijn, gelooft u aan een uiteindelijke overwinning van onze zaak.
Translation: No matter how dark and trying these times may be, believe in the ultimate victory of our cause.
Agenda disapproval:
Dutch: Wie handel weigert, denkt vaak dat hij maar van ons kan pakken wat hij wil. Hij heeft het flink mis.
Translation: He who refuses trade, often thinks he can just take whatever he wants from us. He's sorely mistaken.
(NOTE: I saw Lord Lakely's post on the previous page regarding this line, but decided to just translate it exactly as she says it. They could've easily replaced he (hij) with they (zij) but for some reason they didn't. Because I don't know the intention behind this decision, my translation is literal.)
These may still need some work. Maybe others with a better sense for both languages can correct any mistakes I may have made.