Set "Admin Approval" to "Yes" within CB > Configuration > Registration followed by ensuring "Moderator Approve Users" and "Send Moderators Email" are also set to "Yes" under Moderation. Next edit your user within CB > User Management and ensure "Receive Moderator Emails" is set to "Yes". All of this is basically defaulted already so this should already be the case unless was changed, but should ensure moderator approval is working fine and sending emails. It's unlikely a language plugin could prevent this from working unless the email subject or body was translated to an empty string for whatever reason.

Please keep in mind registration approval happens after email confirmation. So if email confirmation is enabled you won't be notified to approve them until they've confirmed their email address.