Shortcuts for previous/next page on german keyboard are unreliable

Hi there!

I'm struggeling with the previous/next page shortcut on my german MacBook Pro. When I open the "History" menu it says the command for "next page" is ⌘ + ] and "previous page" is ⌘ + [

But there are no such bracket keys on the german keyboard. To get those brackets I have to press Alt + 5 or Alt + 6. So I tried ⌘ + Leftarrow and ⌘ + Rightarrow, but those are kind of unreliable... Sometimes the arrow shortcuts work, sometimes they don't...

Is there any way to manually change the shortcut or is there an alternative shortcut hidden somewhere?

Cheers