v1.19.0

Added

• Added support for the /v3/languages and /v3/languages/resources endpoints
  in the DeepLClient class: getLanguagesForResource() and getLanguageResources().
  These return richer per-resource, per-feature language support than the v2
  language endpoint, including newer languages and features.
• Added new model classes LanguageSupport, LanguageResource, LanguageFeature,
  and ResourceFeature to represent the v3 language response shape.

Changed

• Migrated request bodies for /v2/translate, /v2/glossaries, and
  /v2/write/rephrase to application/json with correctly-typed fields
  (e.g. text is sent as an array, show_billed_characters as a boolean,
  tag lists as arrays, translation_memory_threshold as an integer).
• Send type as a query parameter on GET /v2/languages instead of in the
  request body.
• Enabled OpenAPI request and response validation for the mock-server CI jobs.