Button text change doesn’t work

Trying like hell to get the “Donate” on the button to change to “Contribute” and have code snippets installed with this code that does not do anything either on the product page or the checkout page:

/**

• Customize WooCommerce Order Button Text
  *
• Use the ‘woocommerce_order_button_text’ filter to set a custom
• order button text on the checkout page.
  *
• @return string Custom button text.
  */
  add_filter(‘woocommerce_order_button_text’, ‘change_order_button_text’, 15);
  function change_order_button_text() {
  // Set a constant custom text
  return ‘Confirm Donation’;
  }

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