Translation of Sitzende

It actually happened to my cousin's youngest kid. He was repeatedly warned not to smoke in the courtyard of the school. At the end he found himself expelled from the school. It could have been an interesting experience for him though.
It is late here. I will summarize a few points we discussed and I am looking forward to work with you on this project, hopefully for a long time. I have seen that you have already added a few words.
I teach at the university of natural sciences. I have studied at the ETH in Zurich. At that time I started learning Spanish and I found Vocabulix. Since then I'm using it regularly with joy.