The source node in most cases contains the sample message as written by the developer. If it looks like a dot-delimitted string such as "form.label.firstname", then the developer has not provided a default message.

e-commerce e-commerce key: breadcrumb.ecommerce Order Management Order Management key: order_list.breadcrumb.order_management Customer number Customer number key: order_list.details.customer_number Delivery Address Delivery Address key: order_list.details.delivery_address Invoice Address Invoice Address key: order_list.details.invoice_address Order ID Order ID key: order_list.details.order_id Products Products key: order_list.details.products Basket details Basket details key: order_list.details.title Transaction ID Transaction ID key: order_list.details.transaction_id Type Type key: order_list.details.type Variant Variant key: order_list.details.variant Apply Apply key: order_list.filters.apply Customer number Customer number key: order_list.filters.customer_no Date from Date from key: order_list.filters.date_from Date to Date to key: order_list.filters.date_to Export search results Export search results key: order_list.filters.export_orders Invoice Invoice key: order_list.filters.payment.invoice Paypal Express Paypal Express key: order_list.filters.payment.paypal_express_checkout Payment option Payment option key: order_list.filters.payment_option Select Select key: order_list.filters.select State State key: order_list.filters.state Approval Approval key: order_list.filters.state.approval Confirmed Confirmed key: order_list.filters.state.confirmed New New key: order_list.filters.state.new Offered Offered key: order_list.filters.state.offered Order transfer failed Order transfer failed key: order_list.filters.state.ordered_failed Payed Payed key: order_list.filters.state.payed Rejected Rejected key: order_list.filters.state.rejected Select User Select User key: order_list.filters.udw.select.user User ID User ID key: order_list.filters.user_id Order Management Order Management key: order_list.page_title %viewing% out of %total% items]]> %viewing% out of %total% items]]> key: order_list.pager.viewing Remove lost order Remove lost order key: order_list.table.action.delete Details Details key: order_list.table.action.details Transfer to ERP Transfer to ERP key: order_list.table.action.transfer No orders were found matching your criteria. No orders were found matching your criteria. key: order_list.table.empty Basket ID Basket ID key: order_list.table.header.basket_id Customer name Customer name key: order_list.table.header.customer_name Date Date key: order_list.table.header.date Invoice Invoice key: order_list.table.header.invoice Shop Shop key: order_list.table.header.shop State State key: order_list.table.header.state Total Total key: order_list.table.header.total List List key: order_list.table.title