Hi,
I’ve a problem - In Poland we have a special symbols: ż, ą, ę, ź, ć, ś, ł, ó, ń. These symbols works with font Oswald in others theme. A problem is in Sparkling. How fix it? I think something is wrong with coding localization.
I forgot: www.test.nfszone.pl
Ok, I found it 
I must add
&subset=latin,latin-ext
in link from Google Fonts:
<link href='http://fonts.googleapis.com/css?family=Oswald&subset=latin,latin-ext' rel='stylesheet' type='text/css' />