[ticket/11942] Delete post/topic reason should be added to logs
* Nicofuma/ticket/11942:
[ticket/11942] Don't change the reason to '' when hard deleting
[ticket/11942] Don't show the checkbox if the post is already soft-deleted
[ticket/11942] Remove useless IF in templates
[ticket/11942] Apply the modifications to subsilver
[ticket/11942] Always display delete reason
[ticket/11942] Edits messages
[ticket/11942] Change the formulation
[ticket/11942] Adding the reason to hard deleted topic/post
[ticket/11942] Delete post/topic reason should be added to logs