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Causes results like this:

{{PLURAL|heading=Area Too Large|body=This area is too large to be exported as OpenStreetMap XML Data. Please zoom in or select a smaller area, or use one of the following sources for bulk data downloads:|planet=Array|geofabrik=Array|metro=Array|Array}}

For input like this:
     too_large:
       heading: "Area Too Large"
       body: "This area is too large to be exported as OpenStreetMap XML Data. Please zoom in or select a smaller area, or use one of the following sources for bulk data downloads:"
       planet:
         title: "Planet OSM"
         description: "Regularly-updated copies of the complete OpenStreetMap database"
       geofabrik:
         title: "Geofabrik Downloads"
         description: "Regularly-updated extracts of continents, countries, and selected cities"
       metro:
         title: "Metro Extracts"
         description: "Extracts for major world cities and their surrounding areas"
       other:
         title: "Other Sources"
         description: "Additional sources listed on the OpenStreetMap wiki"