Arduino IDE wrong charset

Hi, I've installed arduino IDE with the tarball for linux 64bit but when I start the program the text/compiler area are rendered with the wrong charset.
I've tried to solve the problem by changing the font and reinstalling the IDE but nothing worked.
As you can see the menus are fine so I don't think is a system wide problem (I even tried running burpsuite which is another java application but everything is rendered perfectly).
Thank you very much in advance.