Error when gettext extension is not installed

[DanWin]

Fatal error: Uncaught Error: Call to undefined function _() in /var/www/html/le-chat-php-master/chat.php:572 Stack trace: #0 /var/www/html/le-chat-php-master/chat.php(1103): print_start('init') #1 /var/www/html/le-chat-php-master/chat.php(4754): send_init() #2 /var/www/html/le-chat-php-master/chat.php(73): check_db() #3 {main} thrown in /var/www/html/le-chat-php-master/chat.php on line 572