Rename buckets in bucket list (feature proposition)

[gregleleu]

Hi, I'd like to be able to rename the rank lists in a bucket list. I had the approach below in mind, does it make sense?

1. add a update_rank_list_label(inputId, text) in R that sends a message to shiny (sendCustomMessage)
2. create a script with a Shiny.customMessageHandler which finds the text element and updates it, and find a place where this script would be loaded (in bucket_list I guess?)

We could also add the option in add_rank_list to put a button to the right of the label with its own icon/text and input id, to be clicked to call update_rank_list_label (or any other function) through an observeEvent