This data-source will use all the languages available in the .NET Framework, (as installed on the web server), to populate the items of a compatible editor, e.g. Data List.
In your new Data Type, selected the [Contentment] Data List option and then the .NET Languages (ISO 639) Data source. You will see the following configuration fields.
Please see the Data List editor page for more information on the List editor options.
The value of the editor will always be the 2 letter ISO code (e.g. en or fr) as a string but depending on the List editor used, this may be wrapped in a List<string>.
Note that ISO 639-1 Alpha 2 code is used, so there is no differentiation between variations of the same language. For example English(Europe) and English(Fiji) will both have the value "en".