WeFitter challenge API

WeFitter API’s challenge engine will bring endless engagement to your platform.For more information about the possibilities in challenges please go to https://www.wefitter.com/en-us/features/gamification/Challenges have multilanguage support on the fields: `Title`, `Slogan`, and `Description`.By default, challenges get the default-language that is configured in the app. Whenever a challenge is requested through the API this challenge will be presented in the default language.If another language is preferred, this can be requested by adding the header parameter `Accept-Language` stating the language short code (ex. `en` for english). If this language short code is not present in the title of the challenge, the default language will be returned.These translation fields contain JSON strings, for example:```{"en":"this is the English title","nl":"this is the Dutch title"}```So to create a multilanguage challenge, please provide the title, slogan, and description field as json strings, be aware that because of serialization this should be formed with backward slashes: {"title": "{\"en\":\"this is the English title\", \"nl\":\"this is the dutch title\"}","slogan": "{\"en\":\"this is the English title\", \"nl\":\"this is the dutch slogan\"}","description": "{\"en\":\"this is the English title\", \"nl\":\"this is the dutch description\"}",}