JetBooking Set calendar language to site locale

code.php

<?php

add_action( 'wp_head', function () { ?>
<script>

	jQuery( document ).on( 'jet-booking/init', () => {

		window.JetPlugins.hooks.addFilter( "jet-booking.input.config", "jetBooking", modifyBookingConfig );
		window.JetPlugins.hooks.addFilter( "jet-booking.calendar.config", "jetBooking", modifyBookingConfig );
		
		function modifyBookingConfig( config ) {
			
			const lang = document.documentElement?.lang;
			
			if ( ! lang ) {
				return config;
			}
			
			config.language = lang.includes('zh-') ? 'cn' : ( lang.split('-')[0] || lang ).toLowerCase();
			
			return config;
			
		}

	} );
	
</script>
<?php } );