To translate the mentioned strings use the WPML string translator and translate the strings of the xstore and xstore-core text domains. To translate the strings from the theme options use WPML option http://prntscr.com/vel71k
7/ Are you talking about single product page or about shop page? Have you translated variations using WooCommerce WPML and synced the products?
13/ Go to WPML > Language URL format http://prntscr.com/veldqq
14/ Provide us with temporary WP Dashboard access to your site to check
