Change the text for the product buttons (Add To Cart, etc) on product archives and individual pages

mindsize_wc_product_button_text.php

<?php

function mindsize_wc_product_button_text() {
	global $product;
	
	$product_type = $product->product_type;
	
	switch ( $product_type ) {
		case 'external':
			return __( 'EXTERNAL PRODUCT TEXT', 'woocommerce' );
		break;
		case 'grouped':
			return __( 'GROUPED PRODUCT TEXT', 'woocommerce' );
		break;
		case 'simple':
			return __( 'SIMPLE PRODUCT TEXT', 'woocommerce' );
		break;
		case 'variable':
			return __( 'VARIABLE PRODUCT TEXT', 'woocommerce' );
		break;
		// support subscriptions
		case 'subscription':
			return __( 'SIMPLE SUBSCRIPTION TEXT', 'woocommerce' );
		break;
		case 'variable-subscription':
			return __( 'VARIABLE SUBSCRIPTION TEXT', 'woocommerce' );
		break;
		default:
			return __( 'DEFAULT TEXT', 'woocommerce' );
	}
}

add_filter( 'woocommerce_product_add_to_cart_text' , 'mindsize_wc_product_button_text' );