I tried a bit and finally found out how to set the + and - key for zoom in Notepad++ with a German keyboard layout*. I thought about writing my first Q&A here, but it might be a too small question for this. Does it matter if the question is very minor?
This question seems to imply yes, but I'm not sure. It's more about when the answer is somewhere else already: Are some questions too easy for Super User?
* Basically choose = and - instead of + and -, but not what a picture of an English keyboard layout would make you think, \ and /.