Minecraft wiki entry for Resource_Pack, associated text: The root tag
 Region: Contains a list of warnings. Note that the key itself is an ISO 3166-1 alpha-3 region code determined by the device's locale setting.
 delay: Optional. Defines how long should the game wait until showing this message in minutes. This can not be zero.
 period: The time interval this message should be shown in minutes. This can not be zero.
 title: The translation identifier of the title of the message. A slot is provided for the translation string, containing how many times this warning has been shown.
 message: The translation identifier of the message. A slot is provided for the translation string, how many times this warning has been shown.