Various date localisation. [skip ci]

resources/twig/layout/default.twig

@@ -134,6 +134,7 @@
     var firstDate = moment("{{Session.get('first').format('Y-m-d')}}");
     var currentMonthName = "{{ currentMonthName }}";
     var previousMonthName = "{{ previousMonthName }}";
+    var language = "{{ language }}";
     var nextMonthName = "{{ nextMonthName }}";
     var currencyCode = '{{getCurrencyCode() }}';
     $('#daterange span').text(titleString);