Unify WPML Comments displays all the comments of a given post for all active languages.
This plugin merges comments lists for all the languages. When active, each post displays all the related comments, including Custom Post types.
It is compatible with WooCommerce product reviews - it re-calculates the product rating average taking into account the reviews for all languages.
Upload the plugin files to the /wp-content/plugins/unify-wpml-comments directory of your WordPress installation.