Problem: Add variations to seconde language product only.
Solution: That's not possible with WPML. The basic concept is that WPML acts just as a translation mechanism for your WordPress content. In terms of products, you're selling essentially the same product across different languages, the product has the same features, stock, variations, etc.
What you can do is to create the product in the second language but not as a translation, so it will be a new separate product.
Problem: I need to translate some non-standard WooCommerce email added by a WooCommerce extension Solution: To solve this you can search and register the strings of the custom emails (Subject, heading, and body) in WPML -> String Translation -> Translate texts in admin screens. Relevant Documentation: https://wpml.org/documentation/getting-started-guide/translating-theme-options/
