Create flow: session UI + sign out

messages/en/create/topNav.json

@@ -0,0 +1,6 @@
+{
+  "saveAndExit": "Save & Exit",
+  "exit": "Exit",
+  "leaveConfirmLoss": "Leave create flow? Your progress will be lost.",
+  "leaveConfirmSaveFailed": "Could not save to your account. Leave anyway?"
+}