The text of many of the buttons throughout CheckoutWC can be changed via a filter. We have a how-to article for adding a custom PHP snippet here.
Note: if you’re looking for coupon related filters you can find them here.
Here is a list of the different button text filters.
- cfw_return_to_cart_link_text
- cfw_continue_to_shipping_method_label
- cfw_return_to_customer_info_label
- cfw_continue_to_payment_method_label
- cfw_return_to_shipping_method_label
- woocommerce_order_button_text
Here are examples of each of them.