As far as I am aware, not much of one. I believe she only knows about him through the stories told to her by Dumbledore and their proximity as they both lived in Godric's Hollow at some point
He dies 
Voldemort.
In 1945, he defeated Gellert Grindelwald.
Jamie Campbell Bower will play the young Gellert Grindelwald. It is unknown who will play him when he is older.
I think it was Albus Dumbledore.
Gellert Grindelwald, the man he was in love with.
Albus Dumbledore dueled Gellert Grindelwald to gain possession of the Elder Wand. He won that duel, Grindelwald was imprisoned, and Dumbledore kept the wand until his death.
Your question makes no sense. Gellert Grindelwald was killed by Tom Riddle in 1998, in the Numengard prison.
In the movies, he plays the role of Gellert Grindelwald as a youth.
He is set to appear as Gellert Grindelwald in Harry Potter and the Deathly Hallows.
Not sure who killed her, it was an accident during the battle between the three men: Albus, Aberforth and Gellert. No, she is a witch.
Yes, Dumbledore was awarded one for his defeat of Gellert Grindelwald.