Add a creation date to the Cart.

Use that date to expire carts older than an interval, via a new workflow.
Config file changes, tests, i18n.

lib/WebGUI/i18n/English/Workflow_Activity_RemoveOldCarts.pm

@@ -0,0 +1,25 @@
+package WebGUI::i18n::English::Workflow_Activity_RemoveOldCarts;
+use strict;
+
+our $I18N = {
+	'cart timeout help' => {
+		message => q|How old should carts be before we delete them?|,
+		context => q|the hover help for the storage timeout field|,
+		lastUpdated => 0,
+	},
+
+	'cart timeout' => {
+		message => q|Cart Timeout|,
+		context => q|a label indicating how old carts should be before we delete them|,
+		lastUpdated => 0,
+	},
+
+	'activityName' => {
+		message => q|Remove Old Carts|,
+		context => q|The name of this workflow activity.|,
+		lastUpdated => 0,
+	},
+
+};
+
+1;