MediaWiki:Apihelp-query+messagegroups-param-prop/en

What translation-related information to get:
 * id:Include ID of the group.
 * label:Include label of the group.
 * description:Include description of the group.
 * class:Include class name of the group.
 * namespace:Include namespace of the group. Not all groups belong to a single namespace.
 * exists:Include self-calculated existence property of the group.
 * icon:Include URLs to icon of the group.
 * priority:Include priority status like discouraged.
 * prioritylangs:Include preferred languages. If not set, this returns false.
 * priorityforce:Include priority status - is the priority languages setting forced.
 * workflowstates:Include the workflow states for the message group.