Fix wrong externalization in HAML (EE)

What does this MR do?

Fixes wrong externalizations in HAML in group member page (member syncing) and project repository mirroring page.

FOSS part: !58843 (merged)

Part of #23855

Screenshots (strongly suggested)

n/a

Does this MR meet the acceptance criteria?

Conformity

• 📋 Does this MR need a changelog?
  • I have not included a changelog entry because ~"technical debt" in Category:Internationalization.
• Code review guidelines
• Style guides
• Separation of EE specific content