@ author Tristan of addon DeclineDuel:
Since I do not know how to contact the author of this addon, and I also did not find some other place to post this subject, I am posting this here.
This is the German localization for the whisper notice to the person who wanted to start a duel:
Ich wuensche nicht, an Duellen teilzunehmen. Dies ist eine automatisierte Nachricht des AddOns DeclineDuel.
The ue in the second word above is actually written as the u with two dots over it. I do not know how to write it, sorry.
Tristan, thank you very much for this addon, it really makes my chars' lives so much easier. :-)