Problem:
I can't access the Translate texts in admin screens feature to add a link to the String Translation.
Solution:
This issue was casued due to a small value set up for the WP Memory limit, it was increased by adding the following code to the wp-config.php file:
define( 'WP_MEMORY_LIMIT', '256M' );
After that the Translate texts in admin screens started to work and the link was added to String Translation making possible its translation
Problem: On this website, both language are lockeed & no product show in WooCommerce Multilingual
Solution: The cause of the issue seemed to be a misconfiguration in WPML -> Settings -> Post Types Translation because 'Products' and 'Variations' post types were set to 'Not Translate'. Changing this configuration to 'Translatable' solved the issue.
I also sync the products in Woocommerce -> Woocommerce Multilingual -> Settings tab -> Troubleshooting link.