WooCommerce is a powerful, extendable eCommerce plugin that helps you sell anything beautifully.
Do you want to add a new language to WooCommerce, then kindly follow the below steps.
Rename the exported file name as woocommerce-yourlanguage.po and woocommerce-yourlanguage.mo [ ex : woocommerce-fr_FR.po and woocommerce-fr_FR.mo ]
After that place the downloaded file under the file path /wp-content/languages/plugins/
Now you have successfully translated the woocommerce extension.