Changes

         _voice_actor = nil,

         _voice_actor = nil,

         _artist = nil,

         _artist = nil,

         _implementation_date = nil,

         _implementation_date = {2017, 5, 2},

         _availability = nil,

         _availability = {"event_drop"},

         _wikipedia = "Japanese escort ship Etorofu",

         _wikipedia = "Japanese escort ship Etorofu",

     },

     },