[MAC ISSUE] Font is too small

[Leyeti]

Hello there,
I just bought King's Bounty The Legend via Steam and I'm quite happy with the game expect for one thing: the font is too small, thus making some text simply unreadable or painful to read.
I tried to switch the game resolution but it's only worse.

I saw a tip here and on other places about changing the font size directly in a data file but I can't find it.

I have a 2011 Mac Book Pro. If anyone can help me, it would be really appreciated.