add all frontend files

node_modules/antd/es/date-picker/locale/sr_RS.js

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+import CalendarLocale from "rc-picker/es/locale/sr_RS";
+import TimePickerLocale from '../../time-picker/locale/sr_RS';
+// Merge into a locale object
+const locale = {
+  lang: Object.assign({
+    placeholder: 'Izaberi datum',
+    yearPlaceholder: 'Izaberi godinu',
+    quarterPlaceholder: 'Izaberi tromesečje',
+    monthPlaceholder: 'Izaberi mesec',
+    weekPlaceholder: 'Izaberi sedmicu',
+    rangePlaceholder: ['Datum početka', 'Datum završetka'],
+    rangeYearPlaceholder: ['Godina početka', 'Godina završetka'],
+    rangeMonthPlaceholder: ['Mesec početka', 'Mesec završetka'],
+    rangeWeekPlaceholder: ['Sedmica početka', 'Sedmica završetka']
+  }, CalendarLocale),
+  timePickerLocale: Object.assign({}, TimePickerLocale)
+};
+// All settings at:
+// https://github.com/ant-design/ant-design/blob/master/components/date-picker/locale/example.json
+export default locale;