akaunting/resources/lang/en-GB/customers.php

<?php

return [

    'allow_login'           => 'Allow Login?',
    'user_created'          => 'User Created',

    'error' => [
        'email'             => 'The email has already been taken.'
    ],

    'notification' => [
        'message'       => ':customer made :amount payment to invoice number :invoice_number.',
        'button'        => 'Show',
    ],
];