Problem: The client is unable to delete the 'leftovers' of the default English (en_US) as the loading icon spins indefinitely, and no leftovers are deleted. This issue does not occur with other languages. Additionally, after deleting a custom language (en_gb) and attempting to recreate it, the system reports that the language still exists due to its remnants in the 'wpcb_icl_languages' table in the PHPadmin database. Solution: We encountered a syntax error when trying to delete the content, which might be causing the issue. You can try deleting the remnants manually using a query. For detailed instructions, please refer to the WPML Forum – How to Delete Language Content from Database. It's important not to modify the language table beyond what is explained in the linked post to avoid further issues. Simply deleting the plugin will not resolve the issue as a full reset would result in the loss of all translated content. If you continue to experience issues or if this solution is outdated or not applicable to your case, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If problems persist, please open a new support ticket.