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addLocale() always cleared the input, even when LocaleSyncService rejected the code because it was already supported - same silent-failure shape as the widgets JSON bug fixed earlier this session. Now checks locales() first and shows an inline error, leaving the input untouched, instead of clearing it like the add succeeded. Verified live: typing an existing locale code and clicking Add now shows 'This language is already supported.' Navigation-section was also audited (id generation, label locale-migration, reorder swap, grouped-footer read-only fallback) - no defects found, it's solid as-is. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>