chore(external-sources): remove dead code and unused i18n keys #3679

Job	Run time
Frontend Build	4m 29s
CLI Tests (ubuntu-latest)	4m 9s
Rust Build Check (ubuntu-latest)	11m 10s
Rust Build Check (macos-15)	15m 36s
Rust Build Check (windows-latest)	22m 15s
	57m 39s

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