How to set svn diff tab size

Hi everybody.

First, i don't use english. because

I think, this help question statements are in a mess.

i want to you say that keep your courage up!

ok, good.

Question :

i wonder that how can i set svn diff tab size in redmine repository diff page.

from 8 tab size to 4 tab size.

do you understand?

You : "I have no idea what you are saying."

I : "I hope you understand."

have a nice day. bye^^

Redmine