feat: translate skills, jobs and industries

[muhammad-ammar]

JIRA: https://2u-internal.atlassian.net/browse/ENT-11386

Add Taxonomy Translation Management Command

Summary

Adds populate_taxonomy_translations command to translate taxonomy data (jobs, skills, industries) from English to target languages using Xpert AI.

Changes

1. New Model: TaxonomyTranslation

• Stores translations with source_hash for change detection
• Unique constraint: (external_id, content_type, language_code)
• Indexed for performance

2. Translation Utilities: taxonomy/translation_utils.py

• translate_item_with_xpert(): Translates using Xpert AI
• TranslationError: Validation exception
• Supports: Spanish (es)

3. Management Command

# Basic usage
python manage.py populate_taxonomy_translations --language es

# Options
--content-type {job|skill|industry|all}  # Default: all
--batch-size N                            # Default: 100
--force                                   # Force retranslation

---

Merge checklist:

• Any new requirements are in the right place (do not manually modify the requirements/*.txt files)
  • make upgrade && make requirements have been run to regenerate requirements
• ./manage.py makemigrations has been run
  • Checkout the Database Migration Confluence page for helpful tips on creating migrations.
  • Note: This must be run if you modified any models.
    • It may or may not make a migration depending on exactly what you modified, but it should still be run.
• Version bumped
• Changelog record added

Post merge:

• Tag pushed and a new version released
  • Note: Assets will be added automatically. You just need to provide a tag (should match your version number) and title and description.
• After versioned build finishes in GitHub Actions, verify version has been pushed to PyPI
  • Each step in the release build has a condition flag that checks if the rest of the steps are done and if so will deploy to PyPi.
    (so basically once your build finishes, after maybe a minute you should see the new version in PyPi automatically (on refresh))
• PR created in course-discovery to upgrade dependencies (including taxonomy-connector)
  • This must be done after the version is visible in PyPi as make upgrade in course-discovery will look for the latest version in PyPi.