Font settings don't work

[Gheyret T.Kenji]

Hi Developers,

I am from Ubuntu Uyghur Translation group.
Font setting in the /etc/lightdm/unity-greeter.conf don't work for main window.
please look at attachment.
Font settings only affected to Menu, but did not effected main Window.

Blow is the content of my unity-greeter.conf's file.
==========================================================

#
# background = Background file to use, either an image path or a color (e.g. #772953)
# logo = Logo file to use
# theme-name = GTK+ theme to use
# font-name = Font to use
# xft-antialias = Whether to antialias Xft fonts (true or false)
# xft-dpi = Resolution for Xft in dots per inch (e.g. 96)
# xft-hintstyle = What degree of hinting to use (hintnone, hintslight, hintmedium, or hintfull)
# xft-rgba = Type of subpixel antialiasing (none, rgb, bgr, vrgb or vbgr)
#
[greeter]
background=/usr/share/backgrounds/space-05.jpg
logo=/usr/share/unity-greeter/logo.png
theme-name=Ambiance
icon-theme-name=ubuntu-mono-dark
font-name=UKIJ Tuz Tom 12
xft-antialias=true
xft-dpi=96
xft-hintstyle=hintslight
xft-rgba=rgb