Font subsets in non-english resource pages

[boukeas]

Resource pages mainly use the Lato and Raleway font families. The former is used for paragraph text, and the latter for headings. Only the latin subset is loaded (by default), so substitute fonts are actually used for non-english text.
On the greek resources page, I tried loading the latin-ext subset for the Lato fonts and they rendered correctly.
<link href="http://fonts.googleapis.com/css?family=Lato:300,400,400italic,600,700&subset=latin-ext|Raleway:300,400,500,600,700&subset=latin-ext|Crete+Round:400italic" rel="stylesheet"
I tried doing the same for the Raleway fonts and it failed: substitute fonts are still used for headings. Raleway is supposed to support a latin-ext subset, but I am not sure whether greek is included in that.