add all frontend files

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

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+import CalendarLocale from "rc-picker/es/locale/km_KH";
+import TimePickerLocale from '../../time-picker/locale/km_KH';
+// Merge into a locale object
+const locale = {
+  lang: Object.assign({
+    placeholder: 'រើសថ្ងៃ',
+    yearPlaceholder: 'រើសឆ្នាំ',
+    quarterPlaceholder: 'រើសត្រីមាស',
+    monthPlaceholder: 'រើសខែ',
+    weekPlaceholder: 'រើសសប្តាហ៍',
+    rangePlaceholder: ['ថ្ងៃចាប់ផ្ដើម', 'ថ្ងៃបញ្ចប់'],
+    rangeYearPlaceholder: ['ឆ្នាំចាប់ផ្ដើម', 'ឆ្នាំបញ្ចប់'],
+    rangeMonthPlaceholder: ['ខែចាប់ផ្ដើម', 'ខែបញ្ចប់'],
+    rangeWeekPlaceholder: ['សប្ដាហ៍ចាប់ផ្ដើម', 'សប្ដាហ៍បញ្ចប់']
+  }, 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;