Add a column in Redmine Report description

Good morning,

I have a question for you about Redmine and Ruby.

I would like to add a new colum in the details of a report [http://192.168.1.175/redmine/projects/ot-2/time_entries] , so Where is [in linux console mode] the file I should change or re-programm?

Thanks in advance.

P.D. I have uploaded an image with the problem.

Image

Redmine