luos/gulliver/js/widgets/js-calendar/lang/jp.js

if (typeof Calendar!='undefined' ) {
  Calendar.LANG("jp", "Japanese", {
        fdow: 1,                // 地元の週の初めの日; 0 = 日曜日, 1 = 月曜日, 等.
        goToday: "本日へ",
        today: "本日",         // ボットンバーに表示
        wk: "週",
        weekend: "0,6",         // 0 = 日曜日, 1 = 月曜日, 等.
        AM: "am",
        PM: "pm",
        mn : [ "1月","2月","3月","4月","5月","6月","7月","8月","9月","10月","11月","12月" ],
        smn : [ "1月","2月","3月","4月","5月","6月","7月","8月","9月","10月","11月","12月" ],
        dn : [ "日曜日","月曜日","火曜日","水曜日","木曜日","金曜日","土曜日","日曜日" ],
        sdn : [ "日","月","火","水","木","金","土","日" ],
        done: "完了" //Appears in bottom bar
});
}