[codex] Fix mojibake in test locality fixture

[karilint]

Summary

• correct stale mojibake text in the test SQL fixture for locality 24750 and related seeded labels
• update the cross-search API regression assertion to expect Romanyà d'Empordà
• leave production code unchanged because the app currently displays the locality correctly

Validation

• cd backend && npm run test:api:local -- --runTestsByPath src/api-tests/crossSearch/get.test.ts
• npm run lint:backend
• npm run tsc:backend
• commit hook: npm run lint and npm run tsc

Fixes #783