Update wording to specify create/manage project vs group labels in labels dropdown

What does this MR do?

Updates strings in labels dropdown shown in Issue, MR and Issue Boards sidebar to reflect context; eg; Project label or Group label.

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

Why was this MR needed?

This change in strings ensure that while viewing labels dropdown, user is aware where Create label action is going to create label or where Manage labels link is going to take user based on current context, which can be a Project or Group.

Screenshots

Issue Sidebar under a Project

Default View	Create Label

Issue Boards under a Group

Default View	Create Label

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• [ ] Documentation created/updated
• [ ] API support added
• Tests added for this feature/bug
• Review
  • Has been reviewed by UX
  • Has been reviewed by Frontend
  • Has been reviewed by Backend
  • [ ] Has been reviewed by Database
• 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-qa manual pipeline job)

What are the relevant issue numbers?

Closes #43702 (closed)