Change WooCommerce Add To Cart Texts

functions.php

<?php

add_filter( 'add_to_cart_text', 'woo_custom_single_add_to_cart_text' );                // < 2.1
add_filter( 'woocommerce_product_single_add_to_cart_text', 'woo_custom_single_add_to_cart_text' );  // 2.1 +
  
function woo_custom_single_add_to_cart_text() {
  
    return __( 'My Button Text', 'woocommerce' );
  
}
                                                                                               
                                                                                               add_filter( 'add_to_cart_text', 'woo_custom_product_add_to_cart_text' );            // < 2.1
add_filter( 'woocommerce_product_add_to_cart_text', 'woo_custom_product_add_to_cart_text' );  // 2.1 +
  
function woo_custom_product_add_to_cart_text() {
  
    return __( 'My Button Text', 'woocommerce' );
  
}

// Alter WooCommerce View Cart Text
add_filter( 'gettext', function( $translated_text ) {
    if ( 'View cart' === $translated_text ) {
        $translated_text = 'Your new text here';
    }
    return $translated_text;
} );