To add a Google font to your site, go to Design Settings, and select the Fonts tab in the upper left.
(for larger image: Right Click>Open Image in New Tab)
Next, select a Google font from the list, choose a font, and select the style. You'll see a preview of the font in the selected fonts to the right.
To add the font you've selected, click on the SAVE button in the bottom right corner.
Congratulations! You've added a new Google font to your site!
Google fonts actually have a handy way to see if the language you'd like it supported by going to Google fonts and filtering the language. Like so:
Voila! Now you can be sure the font you're adding supports the language you need it to.