Add lunchmeeting is Dutch

Author: edwinm

src/en/activities/2025/lunchmeeting-with-kilian-valkhof.md

@@ -18,6 +18,6 @@ The lunch meeting is an online meeting during lunch that you can follow from beh
 The guest, in this case Kilian Valkhof (@Kilian@mastodon.social), talks about a certain
 topic (this time **Dialog from a to z**) and afterwards you can discuss/chat about it.
 
-The meeting starts at 12:30.
+The meeting starts at 12:30. Both the presentation and the discussion will be held in Dutch.
 
 See [Lunchmeeting Meetup](https://www.meetup.com/fronteers-nl/events/307212733/).