Help Changing Ingame Font

I don't know why but I've spend 20 minutes digging and I can't find a way to change the font ingame. I've got a awesome new interface but the font is not my cup of tea.

I'd like to change it (client is Freya 2nd throne). What file and what program do I need to change it?
Ty in advance :)

Edited April 5, 20179 yr by snowboard