// 'error.client_exists' => 'Client with this name already exists.',
// 'error.invoice_exists' => 'Invoice with this number already exists.',
// 'error.no_invoiceable_items' => 'There are no invoiceable items.',
// 'error.client_exists' => 'Client with this name already exists.',
// 'error.invoice_exists' => 'Invoice with this number already exists.',
// 'error.no_invoiceable_items' => 'There are no invoiceable items.',