data(wallets): normalize languages to canonical BCP 47

[bcabreraike-cmyk]

Summary

• normalize 132 explicit wallet language cells across 10 wallet CSVs
• remove ambiguous tokens only where they cannot be safely identified; leave them blank rather than guess
• remove duplicate language tags while preserving all other columns byte-for-byte
• wire CI to the pinned validation asset and fixtures from the companion tooling branch

Validation

• 90 wallet CSV files audited; 0 language validation errors
• 132 language cells changed; only the languages field changed
• CSV to JSON to JSON Schema validation passed locally
• only pre-existing network-chain warnings remain in the full conversion run

Dependency

This data update depends on the companion json-tools PR targeting json-tools.

Closes #3594

[bcabreraike-cmyk]

CI diagnosis: this data PR depends on the companion tooling PR #3601. The current json-tools branch does not yet contain tools/validation/language_tags.json, so the isolated job fails while copying that dependency. Once #3601 is merged into json-tools, please rerun this PR's checks; the log does not indicate a CSV data defect.