Rename or rework the Backlog to avoid confusion

Description

Currently, when users goes to the backlog of a board/project, they might see sprints beside the backlog (issues without sprint assigned to them), including the active sprint.

The Active Sprint might include Done items. This can lead to some confusion, as users do not expect Done items to appear in the Backlog part of the project.

Suggestion

Either avoid including Done items on the active sprint that is displayed in the backlog, or, remove the active sprint from there altogether. Other possibilities are:

1. Rename "Backlog" to something more related to the content listing because when clicking, it sets up the users to thinking all they will see are backlog items, which are items not yet assigned to a sprint, and items not yet started in a sprint, or
2. Align all lists on the "Backlog" page to represent the definition of backlog:

• Issues assigned to a sprint but not yet started,
• Issues not yet assigned to a sprint.