Feat/df 1063: Facilitate 'language' being passed to downstream systems

[jbarnsley10]

Proposed change

• Facilitate 'language' being passed to downstream systems
• Fixes to repeater title in mini-summary for the repeater, as well as Check Your Answers page

Jira ticket:DF-1063

Type of change

• Bug fix
• New feature
• Breaking change
• Misc. (documentation, build updates, etc)

Checklist

• You have executed this code locally and it performs as expected.
• You have added tests to verify your code works.
• You have added code comments and JSDoc, where appropriate.
• There is no commented-out code.
• You have added developer docs in README.md and docs/* (where appropriate, e.g. new features).
• The tests are passing (npm run test).
• The linting checks are passing (npm run lint).
• The code has been formatted (npm run format).

[sonarqubecloud]

Quality Gate failed

Failed conditions
B Maintainability Rating on New Code (required ≥ A)
2 New Major Issues (required ≤ 0)

See analysis details on SonarQube Cloud

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