On the DN and invoice some Dutch words (instead of placeholders) are printed, I want to print other words instead. Like 'Afleveringsbewijs' on a DN is not quite right, this should be 'Pakbon'.
Where can I change this?
Also in the {contact} placeholder, my name and address are printed, but the country is ' Netherlands', I would like this to be ' Nederland',: in Dutch.

Hello. Dutch language is stored in SITE ROOT/language/nl-NL/nl-NL.com_vminvoice.ini, you can change translations there.
(beware! files gets overwritten on component update, so you have to make modifications again after update - or make some backup of this file and rewrite back after update).
If you you have enabled "cache PDFs", you must reset cache after you make some modification to translation files - do it by changing some configuration option, saving and changing this option back, so cache will be cleared.
If you belive translation can be better, you can send us fixed version to Diese E-Mail-Adresse ist gegen Spambots geschützt! Du musst JavaScript aktivieren, damit Du sie sehen kannst. , so we can include it in our next release.

As for country name - currently we take country names directly from VM table (VirtueMart -> Configuration -> Countries). So you can change country name there. But we noticed that country names should be translated using com_virtuemart_countries.ini file to invoice language. So we will include this functionality to our next release. Thanks much for mentioning this.

Solved via e-mail.