Adds a Translation for a Knowledge Article in a specific language

If you have trouble with creating a Knowledge Article, try creating Knowledge Articles via the web interface, and then access those Knowledge Articles via the API. This way you can see examples of the fields and sub-elements attached to the Knowledge Article. A common source of problems during write/update request is caused when users omit required fields, or insert invalid data in a field (e.g. reference a CATEGORY_ID that does not exist in the user's Insightly instance.