Default WordPress Email

Hello, i would like to ask you guys on how to change the default email thats sent my wordpress… Atm on my website when someone registers they get an email sent automatically with a auto generated password, which is fine.

But how do i change the content of this email? its all in english for example, and i want to change that.. also the content it self..

I have tried to find a solution for hours and hours and nothing helps… no plugins are doing what i need them to, which is a very simple thing.