There are lots of nice people who take the time to translate превеждат WooCommerce in different languages.
The Bulgarian translaction of WooCommerce a little bit under 70%. WordPress will only download the translation if it reaches 100%.
For this reason it's good to take the time to do some translating.
https://translate.wordpress.org/projects/wp-plugins/woocommerce/stable/bg/default/
After you have suggested translations Some of the editors will check and approve or reject your translation.