[EE] i18n: externalize strings from 'app/views/shared/members'

EE port of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/23125.

What does this MR do?

Reopening of https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/6560.

i18n externalize strings from app/views/shared/members, as part of gitlab-ce#47670

What are the relevant issue numbers?

Does this MR meet the acceptance criteria?

• [-] Changelog entry added, if necessary
• [-] Documentation created/updated
• [-] Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• [-] Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.