We'll create fresh WordPress site with Customize Add to Cart Button Text for WooCommerce installed. You have 20 minutes to test the plugin after that site we'll be deleted.
Customize Add to Cart Button Text for WooCommerce plugin lets you change text for Add to cart button.
Add to cart labels can be set:
Additionally, you can use shortcodes in labels, for example, show current product price in button label:
Buy now for [alg_wc_atcbl_product_price]
Plugin is WPML/Polylang compatible, i.e. you can set different labels for different languages on a multi-language sites.