In the Dutch translation, many names are also translated.
Okay okay, next part is hidden for those who don't wanna now yet
Sirius Black, is called Sirius Zwarts in Dutch (black=zwart), so if R.A.B. is really Regulus Black it should be R.A.Z. in the Dutch books.
But as no one knows what will happen in the next book (the publisher nor the translator) I wonder how they will solve this problem :D
Just a thought