Choosing languages
translation_languages is the full list and replaces the current one. Read it with Get macro settings first and send every language you want to keep. Send at most 10 lower-case codes such as es, each one of supported_translation_languages, with no repeats; anything else is rejected with a 400. An empty list turns macro translation off.
suggestions_enabled appears in the response but cannot be changed here. Turn suggested macros on or off for the workspace in Settings → Workspace → Suggested macros.