WPML's Translation Management module makes it easy to manage the translations of the entire site, from one central admin screen. You will be able to assign translation jobs to your own translators, or outsource translation work to translation services. Related documentation:
Problem: Uncaught InvalidArgumentException: element_id and type do not match for element_id: 476
Solution: This kind of error is happening because of corrupt entry or misconfiguration in the Database. In this case element_type which has element_id 476 of wp_icl_translations database table doesn't match post_revision of this entry in wp_posts database table.
Please try the following steps after a full site backup and make sure you are still having the issue.
1) Go to your database using phpMyAdmin(or something similar)
2) Go to wp_icl_translations database table
3) Find entry with element_id: 476 and delete that row