Hello,
Theme Options > WooCommerce > Shop elemets > Sale & Out of Stock > “Sale” Label Text.
WPML > String translation > scroll down and press on “Translate texts in admin screens” link. You’ll see a list of fields, choose the fields you’d like to translate. For example – http://prntscr.com/10gxxqu After that go back to the String Translation section and translate necessary content.
Regards















