Hello,
You need to translate the parent theme. The child theme should be translated only in case you added custom code in child theme that includes localization functions. To prevent the translation loss after updates, make sure you placed translation files of the theme into the /wp-content/languages/themes/ folder with correct names (language name and xstore theme suffix, e.g xstore-de_DE.po, xstore-de_DE.mo).
System location – https://prnt.sc/woup5x
XStore Core plugin – Loco translate > Plugins > XStore Core > New language > Choose a language + Choose a location – System > Start translating.
WoCommerce plugin – https://prnt.sc/wousp4 , https://docs.woocommerce.com/document/woocommerce-localization/
Regards















