Font missing special slovak characters

[SkyHiRider]

I have a slovak eshop that uses characters such as š ť ž and the font does not support them. How can I fix this?

 

I was thinking of manually editing the source font file but I have no idea what data should I add.

The store with the broken font can be seen here: http://medhead.eu/eshop/

 

Thanks in advance for any tips!

[SkyHiRider]

I fixed my problem by:

1. Finding my font on https://www.google.com/webfonts and downloading it in a zip file.
   
2. I extracted the font file and converted it into the file formats that Prestashop understands by using http://www.font2web.com/
   
3. Uploaded the fonts to the themes font directory by overwriting the old fonts.
   

 

Now it looks as it should, hooray!