warning message when arbitrating a task

Steps to reproduce

• double click to select an answer for an item in grouping or arbitration campaign,
• the message appears: Your transition choice couldn't be applied to task 4. [object Object]

Expected behaviour

• The message must be fixed:
  • Your transition choice couldn't be applied to task 4.
  • No object Object in the message
• the message must not appear when double-clicking or 2 clicks with latency (before the loader appears)

Implementation

disable the double click with a latency check (by instance a second click is ignored if performed after less than 100 ms)