Hello, Charalith,
Thank you for your response.
1/ Go to Loco translate > Plugins > edit translation of WooCommerce > and click on Sync https://xstore.helpscoutdocs.com/article/103-translation-files-update , then find and translate “Add to cart” text.
We can’t Save our changes with access you provided – https://prnt.sc/iW8SRPxYuVJL
2/ Change the location of translation files for the Core plugin from https://prnt.sc/CfTbX5mMCKzG to System (/wp-content/languages/plugins folder). Then Sync translation.
Let us know the results.
Kind Regards,
8theme team