At this time, there is no supported way of customizing prompts in CWMS. I am sure there would be a way to replace the wav file on the system, but that requires CLI access to the system which is restricted to Cisco Advanced Services and TAC.
This might be available in the future versions, but at this time I am not aware of any such initiative being raised with Product Management. If this is something really important to your customer, you can talk to Cisco Account Team to file an enhancement request for evaluation by Product Management.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.