Hello,
1. This is default WC widget, you can check this text with Storefront (default woocommerce theme).
2. Please see screenshot – http://prntscr.com/ioufpy (default woocommerce theme activated).
Change this text you can via WC translation files.
3. This also relates to woocommerce, so it would be better to contact the plugin author.
Feel free to ask if you have any other questions.
Regards