woocommerce_email_setup_locale │ filter-hook │ WC 1.0

Usage

add_filter( 'woocommerce_email_setup_locale', 'wp_kama_woocommerce_email_setup_locale_filter' );

/**
 * Function for `woocommerce_email_setup_locale` filter-hook.
 * 
 * @param  $true 
 *
 * @return 
 */
function wp_kama_woocommerce_email_setup_locale_filter( $true ){

	// filter...
	return $true;
}

$true

-

Where the hook is called

if ( $switch_email_locale && $this->is_customer_email() && apply_filters( 'woocommerce_email_setup_locale', true ) ) {

Where the hook is used in WooCommerce