How to modify the default 'Idea merged into' text?

My guess is that this is a hidden phrase you could ask the team about and then add into the Phrasing tool on the backend. 

It might be two hidden phrases: one for the first part and one for the line about merged votes. If that’s the case, you probably want to edit the second one after merged vote totals. 

Now, here’s where I come in and tell you how you can do it with Zapier. 

First, I believe when you change a status via this API operation, that automated reply does not occur. Mostly that’s an FYI, but if you wanted to build a different way to change statuses, you could create a custom reply that does the same thing.

Second, the easier approach (if you can’t just edit the phrase) is that you could probably automate editing the reply. 

1. Trigger on New Reply
2. Filter conditions
   • Reply to Idea content type
   • contains the standard reply text and the “Closed (Duplicate” status
3. Edit a reply
   • Pull in the content from the original automated reply and just append html to the end of it for whatever you want to say.