Added is.js language file

lang/is.js

@@ -0,0 +1,10 @@
+
+$.fullCalendar.lang("is", {
+	defaultButtonText: {
+		month: "Mánuður",
+		week: "Vika",
+		day: "Dagur",
+		list: "Dagskrá"
+	},
+	allDayText: "Allan daginn"
+});