Odyssee has a system of translations on all admin tables (like task type, task status). When you are working with the back end with session state, the back end manages it automatically and provides you the data automatically translated to the correct language of the user that is logged in.
When you are using the API, the system does not know in which languages data needs to be translated. To achieve that, you can pass a specific parameter via the http request headers using the
X-Language: en-US (or nl-NL, fr-FR, it-IT, de-DE etc).