[PHP-WEBMASTER] [web-php] PR #1126: Update Dutch translation for 8.4 announcement

Pull Request: Update Dutch translation for 8.4 announcement by nielsdos · Pull Request #1126 · php/web-php · GitHub
Author: nielsdos

There were some last minute changed that I didn't have a chance to work on.
It fixes a grammar mistake due to a sentence structure change last minute; and it adds two missing translations.
cc @saundefined