Polish letters

Hi,

first of all thanks for creating this great theme. It is by far the best I have ever used so far. I have just a problem with it.
On my website http://www.bielanynaszemiasto.eu/ I am posting information in Polish. The problem is that letters that exist in the Polish alphabet but not in the English appear slightly bigger and bold.
How can I fix this issue? I must say I am not a programmer, just DIY, so I would be grateful if you could suggest me the easiest solution available 🙂

Thanks,

Giovanni