Renamed 'Overview' to 'Project' in the contextual navigation at a project level

What does this MR do?

Renamed 'Overview' to 'Project' in the contextual navigation at a project level

Are there points in the code the reviewer needs to double check?

No

Why was this MR needed?

closes https://gitlab.com/gitlab-org/gitlab-ce/issues/43430

Screenshots (if relevant)

Before	After

|

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Review
  • Has been reviewed by Frontend
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together
• Internationalization required/considered
• End-to-end tests pass (package-and-qa manual pipeline job)

What are the relevant issue numbers?

#43430 (closed)