Another word for no regrets is impenitent.
Impenitent means to not have any regrets or feel any shame about one's attitude or actions.
Examples of impenitent in a sentence :
-The bully was impenitent when he pushed the little boy off the swings.
-Julie's impenitent attitude after reading Sara's diary in front of her whole class, led to detention from the Headmistress.
On a general level, the difference between interpretation and translation is that interpretation deals with spoken language in real-time while translation focuses on written content.
The men are filled with joy as the bombs fall around them because they want the Germans to be defeated. Wiesel mentions how they've heard the Germans were losing some battles, but this was the first time they had proof. This shows that they "no longer fear death". They have been living with so much death that it is a regular occurrence. Also, a death that is caused as a result of Germany's defeat is better than a death at the hands of the Germans.