Changing the terminology for the countdown timer in the feast theme is quite easy.
Lets first locate the file that we need to change. You will find the meta-box-extended-functions.php file in the options folder of your theme.
around line 360 of the meta-box-extended-functions.php file you will find the get_for_timer_function and around line 390 you will find the term that you can change:
$output .= '<div class="announce"><span>' . __('Next show in', 'feast') . '</span></div><div class="arrow-left"></div><div class="time" contents="' . $offset .'" rel="' . $cal_the_entry['strdate'] . '"></div>';
you need to change the
'Next show in'
Do not forget the brackets it needs to stay in place.