Use correct XDG prefixed font path for font install function
Use correct XDG prefixed font path for font install function

The older .fonts directory has deprectated been deprecated in
fontconfig. These changes use the XDG prefixed font path instead. This
path resolves to $XDG_DATA_HOME/fonts/, with $XDG_DATA_HOME resolving
to ~/.local/share if not set.

See following commit for ~/.fonts deprecation:
http://cgit.freedesktop.org/fontconfig/tree/fonts.conf.in?id=d6a5cc665a1d7e91332944353e92c83ad114368c#n24

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