Change the Google fonts to support additional characters

Go to Theme Options → Design → Fonts. If you have chosen a Google Font for the Header, go to the Google Fonts website and choose the font again, this time at the Choose the character sets you want: option you can choose additional character sets. Once you’ve done this, copy the <link> tag into the theme options. Repeat this for the font on the Content tab if necessary.

Still having trouble? Head over to the forums.