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.

Couldn't save the prices Couldn't save the prices key: price.not_saved Prices saved successfully Prices saved successfully key: price.saved Prices for %contentName%, List price %price% Prices for %contentName%, List price %price% key: price.table.header Product not found Product not found key: product.not_found Couldn't save shipping costs Couldn't save shipping costs key: shipping_management.not_saved Shipping costs saved successfully Shipping costs saved successfully key: shipping_management.saved Couldn't save stock Couldn't save stock key: stock.not_saved Stock saved successfully Stock saved successfully key: stock.saved