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

<?php

return [

    'invoice_number'    => 'Invoice Number',
    'invoice_date'      => 'Invoice Date',
    'total_price'       => 'Total Price',
    'due_date'          => 'Due Date',
    'order_number'      => 'Order Number',
    'bill_to'           => 'Bill To',

    'quantity'          => 'Quantity',
    'price'             => 'Price',
    'sub_total'         => 'Subtotal',
    'discount'          => 'Discount',
    'tax_total'         => 'Tax Total',
    'total'             => 'Total',

    'item_name'         => 'Item Name|Item Names',

    'show_discount'     => ':discount% Discount',
    'add_discount'      => 'Add Discount',
    'discount_desc'     => 'of subtotal',

    'payment_due'       => 'Payment Due',
    'paid'              => 'Paid',
    'histories'         => 'Histories',
    'payments'          => 'Payments',
    'add_payment'       => 'Add Payment',
    'mark_paid'         => 'Mark Paid',
    'mark_sent'         => 'Mark Sent',
    'download_pdf'      => 'Download PDF',
    'send_mail'         => 'Send Email',
    'all_invoices'      => 'Login to for all invoices',

    'status' => [
        'draft'         => 'Draft',
        'sent'          => 'Sent',
        'viewed'        => 'Viewed',
        'approved'      => 'Approved',
        'partial'       => 'Partial',
        'paid'          => 'Paid',
    ],

    'messages' => [
        'email_sent'     => 'Invoice email has been sent successfully!',
        'marked_sent'    => 'Invoice marked as sent successfully!',
        'email_required' => 'No email address for this customer!',
    ],

    'notification' => [
        'message'       => 'You are receiving this email because you have an upcoming :amount invoice to :customer customer.',
        'button'        => 'Pay Now',
    ],

];