WooCommerce Buy Button Customizer (Product basis)

wbbc.php

<?php
/*
	Plugin Name: WooCommerce Buy Button Customizer
	Plugin URI: http://amallory.com
	Description: Customize Button Labels for WooCommerce Buy buttons on product by product basis
	Version: 0.1.5
	Author: AJ Mallory
	Author URI: http://amallory.com
 	License: GNU General Public License v2.0
 	License URI: http://www.gnu.org/licenses/gpl-2.0.html
  */

if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly
}

/**
 * WBBC_Meta_Box_Buy Button Class.
 */
class WBBC_Meta_Box_Buy_Button {
	static private $buy_button_text;

	/**
	 * Output the metabox.
	 *
	 * @param WP_Post $post
	 */
	public static function output( $post ) {

		woocommerce_wp_text_input(
			array(
				'id'          => 'single_product_buy_button_text',
				'label'       => __( 'Procuct Detail Button Text', 'woocommerce' ),
				'placeholder' => 'Add to Cart',
				'description' => __( 'Enter label for the product detail buy button', 'woocommerce' )
			)
		);

		woocommerce_wp_text_input(
			array(
				'id'          => 'product_buy_button_text',
				'label'       => __( 'Product List Button Text', 'woocommerce' ),
				'placeholder' => 'Add to Cart',
				'description' => __( 'Enter label for the product list buy button', 'woocommerce' )
			)
		);
	}

	/**
	 * Save meta box data.
	 *
	 * @param int $post_id
	 * @param WP_Post $post
	 */
	public static function save( $post_id, $post ) {

		$single_product_buy_button_text = $_POST['single_product_buy_button_text'];
		if( !empty( $single_product_buy_button_text ) )
			update_post_meta( $post_id, 'single_product_buy_button_text', esc_attr( $single_product_buy_button_text ) );

		$product_buy_button_text = $_POST['product_buy_button_text'];
		if( !empty( $single_product_buy_button_text ) )
			update_post_meta( $post_id, 'product_buy_button_text', esc_attr( $product_buy_button_text ) );

	}

	/**
	* Add Metabox for Buy Button lables on woocommerce product screens
	*/
	public static function construct() {
		add_action( 'woocommerce_process_product_meta', 'WBBC_Meta_Box_Buy_Button::save', 30, 2 );
		add_meta_box( 'wbbc-product-buy-button', __( 'Buy Button', 'woocommerce' ), 'WBBC_Meta_Box_Buy_Button::output', 'product', 'side', 'low' );

	}

	/**
	* Output Buy Button lables single product page
	*/
	public static function wbbc_product_single_add_to_cart_text( $button_text, $product ) {
	 	$product_single_button_text = get_post_meta( $product->id, 'single_product_buy_button_text', true );
		if( !empty( $product_single_button_text ) ) return esc_attr( $product_single_button_text );
		else return $button_text;
	}

	/**
	* Output Buy Button lables product page
	*/
	public static function wbbc_product_add_to_cart_text( $button_text, $product ) {
	 	$product_buy_button_text = get_post_meta( $product->id, 'product_buy_button_text', true );
				if( !empty( $product_buy_button_text ) ) return esc_attr( $product_buy_button_text );
				else return $button_text;
	}

}
add_action( 'admin_init', 'WBBC_Meta_Box_Buy_Button::construct', 80 );
add_filter( 'woocommerce_product_single_add_to_cart_text', 'WBBC_Meta_Box_Buy_Button::wbbc_product_single_add_to_cart_text', 30, 2 );
add_filter( 'woocommerce_product_add_to_cart_text', 'WBBC_Meta_Box_Buy_Button::wbbc_product_add_to_cart_text', 10, 2 );