TASKMAN-17 : Adjust the single task view UI

TASKMAN-17 : Adjust the single task view UI and also 
TASKMAN-18 : Adjust the single task edit UI

Added the Creation Date field which is not editable
Adjusted the English translation for the new field
I wonder if we need to display the ID of the task.  On the user POV, it has no sense.  Moreover, I think it's only for internal purpose (so mainly technical reasons). WDYT?