WooCommerce must hard code the wording of certain elements in the plugin, including the Add to Cart button. You may prefer the button say something else or use your language.
You can change this one of two ways, the safe way, or editing the files to change the text (not recommended).
The Safe Way
Use this method if you do not have WordPress theme development skills or coding knowledge, or if you need to translate WooCommerce into your own language.
Note that WooCommerce comes in several languages, so you may find switching the language in the settings is far easier!
- Use WooCommerce Checkout Manager by YITH, a plugin with just about every WooCommerce interface customization you need.
- OR Download and install a translation plugin or use PoEdit See this article for some tips.