PLACEHOLDER
GET /entities/items/{item_id}/labels
GET /entities/items/{item_id}/labels/{language_code}
GET /entities/items/{item_id}/descriptions
GET /entities/items/{item_id}/descriptions/{language_code}
GET /entities/items/{item_id}/aliases
GET /entities/items/{item_id}/aliases/{language_code}
Include:
- conditional request using HTTP headers
- mediawiki user authentication/authorization
- error handling