You're doing something wrong then.
Step by step:
Go into lang folder
Create new file called 'Lang.cosmetics.abz'
Edit file and change it to this:
[Alt.Binz]
author=rdl
description=Font
fileversion=1.00
rtl=0
languagename=Font change
[TAltBinzMainForm]
downtree.Font.Name=Terminal
downtree.Font.Size=25
downtree.DefaultNodeHeight=30
Save file
Load altbinz
Go into setup
Lower left corner of that form, change language to 'Font change'
There is no way you will get anything but this: