Mini calendar module arrows

Hello,
i changed the "<" and "<<" arrows in the calendar with font awesome arrows, but, when i click on one of them, the arrows change back at the default values ("<" and "<<"). I try to find the file that defines the symbols, but i haven't found enything yet.
Any help?

Thanks

Hi Michail

The other file is components/com_eventbooking/view/calendar/tmpl/mini.php

Please modify that file and it will work well

Tuan