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

if (typeof Calendar!='undefined' ) {
  Calendar.LANG("es", "Español", {
        fdow: 1,                // first day of week for this locale; 0 = Sunday, 1 = Monday, etc.
        goToday: "Ir a Hoy",
        today: "Hoy",         // appears in bottom bar
        wk: "sem",
        weekend: "0,6",         // 0 = Sunday, 1 = Monday, etc.
        AM: "am",
        PM: "pm",
        mn : [ "Enero","Febrero","Marzo","Abril","Mayo","Junio","Julio","Agosto","Septiembre","Octubre","Noviembre","Diciembre" ],
        smn : [ "Ene", "Feb", "Mar", "Abr", "May", "Jun", "Jul", "Ago", "Sep", "Oct", "Nov", "Dic" ],
        dn : [ "Domingo","Lunes","Martes","Miercoles","Jueves","Viernes","Sabado","Domingo" ],
        sdn : [ "Do", "Lu", "Ma", "Mi", "Ju", "Vi", "Sa", "Do" ],
        done: "Hecho" //Appears in bottom bar
});
}