ENGCOM-2314: [Backport] Added translation function for Magento_Braintree module's template file. #16770

 - Merge Pull Request #16770 from sanganinamrata/magento2:2.1-develop-PR-port-16690
 - Merged commits:
   1. 48530d2

Author: magento-engcom-team

app/code/Magento/Braintree/view/frontend/templates/paypal/button.phtml

@@ -30,6 +30,7 @@ $config = [
        class="action-braintree-paypal-logo" disabled>
         <img class="braintree-paypal-button-hidden"
              src="https://checkout.paypal.com/pwpp/2.17.6/images/pay-with-paypal.png"
-             alt="Pay with PayPal"/>
+             alt="<?= $block->escapeHtml(__('Pay with PayPal')) ?>"
+             title="<?= $block->escapeHtml(__('Pay with PayPal')) ?>"/>
     </button>
 </div>