Fixed issue #08514: No control on duplicate sub question code (case Unsensitive)
Dev: original was Could Not Activate Survey, but DB issue
Dev: Control unsensitive unicity in javascript
Dev: Control unsensitive unicity in model
Dev: Replace alert by .notify : maybe add a global function ? (sendAlert(message,style))
Dev: validate unicity BEFORE try to submit else there are some db issue (to be tracked too)