Hi kanagaratnam,
Thanks for reaching to us.
1, 3. It looks like you want to disable both of these buttons, if so, and you are using a Custom Single Product layout, which is built with WoodMart WooCommerce builder. Navigate to Layouts > Layout to edit Single product layouts and delete Product add to cart
widget https://prnt.sc/tvuSkBq2FRcu.
In order to create button to jump to the section, you can use Button
widget instead https://prnt.sc/V1gBDlRLw4Ek
2. + In order to change / translate words. Please make sure you synced the strings first before changing / translating WooCommerce, WoodMart Core plugins and WoodMart theme. You can refer to article
https://xtemos.com/docs-topic/theme-translation/
https://xtemos.com/docs-topic/how-to-make-woodmart-multilingual-with-wpml/
+ You are also need to select the language for the backend and theme settings for admin from the admin user profile, please edit the user’s profile and then select the language for that user it will show the same on the backend.
Regards,