Internationalize Admin namespace plan

What does this MR do?

Internationalize Admin namespace plan

Rework of !31897 (closed) by @suzu-1990

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Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• [n/a] Documentation (if required)
• Code review guidelines
• [n/a] Merge request performance guidelines
• Style guides
• [n/a] Database guides
• Separation of EE specific content