WooCommerce - Responses to reviews are not registered for translation

Overview of the issue

WPML Multilingual & Multicurrency for WooCommerce allows you now to translate and display product reviews. However, it is not possible yet to translate responses to those reviews.

Workaround

Please, make a full backup of your site before proceeding.

1. Edit wp-content/plugins/woocommerce-multilingual/classes/Reviews/Translations/FrontEndHooks.php file.
2. Replace:

   	private static function isNonEmptyReview( $comment ) {
   		return Obj::prop( 'comment_content', $comment )
   		       && Relation::propEq( 'comment_type', self::COMMENT_TYPE, $comment );
   	}
   

   With:

   	private static function isNonEmptyReview( $comment ) {
   		return Obj::prop( 'comment_content', $comment )
   		       && Relation::propEq( 'comment_type', self::COMMENT_TYPE, $comment ) || Relation::propEq( 'comment_type', 'comment', $comment );
   	}
   

3. Then open go to: wp-content/plugins/woocommerce-multilingual/classes/Reviews/Translations/Mapper.php file.
4. Replace:

   	private function getUnregisteredReviews() {
   		// phpcs:disable WordPress.DB.PreparedSQL.NotPrepared
   		$q = "SELECT c.comment_ID, c.comment_post_ID, c.comment_content, c.comment_type, tr.language_code, st.name, st.value
   				FROM {$this->wpdb->comments} AS c
   				LEFT JOIN {$this->wpdb->prefix}icl_translations AS tr
   					ON tr.element_id = c.comment_post_ID AND tr.element_type = 'post_product'
   				LEFT JOIN {$this->wpdb->prefix}icl_strings AS st
   					ON c.comment_content = st.value
   						AND st.context = '" . FrontEndHooks::CONTEXT . "'
   				WHERE c.comment_type = '" . FrontEndHooks::COMMENT_TYPE . "'
   					AND st.name IS null";
   
   		return (array) $this->wpdb->get_results( $q );
   	}
   

   With:

   	private function getUnregisteredReviews() {
   		// phpcs:disable WordPress.DB.PreparedSQL.NotPrepared
   		$q = "SELECT c.comment_ID, c.comment_post_ID, c.comment_content, c.comment_type, tr.language_code, st.name, st.value
   				FROM {$this->wpdb->comments} AS c
   				LEFT JOIN {$this->wpdb->prefix}icl_translations AS tr
   					ON tr.element_id = c.comment_post_ID AND tr.element_type = 'post_product'
   				LEFT JOIN {$this->wpdb->prefix}icl_strings AS st
   					ON c.comment_content = st.value
   						AND st.context = '" . FrontEndHooks::CONTEXT . "'
   				WHERE c.comment_type = '" . FrontEndHooks::COMMENT_TYPE . "' OR c.comment_type = 'comment'
   					AND st.name IS null";
   
   		return (array) $this->wpdb->get_results( $q );
   	}
   

5. Finally, go to WooCommerce → WooCommerce Multilingual → Status and click on the Troubleshooting link.
6. Select Register product reviews for translations.
7. Click on the Start button.