Change the default Simplified Chinese fonts to WenQuanYi Micro Hei on Fedora 21

[Peng Wu]

Hi,

After polling on Fedora Chinese mailing list, I changed the default
Simplified Chinese fonts of Fedora 21 to WenQuanYi Micro Hei.

This change will give better rendering results on Full HD screen.

The changes are landed on Fedora 21 comps.

Feel free to comment it.

Thanks,
  Peng Wu