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frontend/node_modules/antd/es/date-picker/locale/pl_PL.js

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+import CalendarLocale from "rc-picker/es/locale/pl_PL";
+import TimePickerLocale from '../../time-picker/locale/pl_PL';
+// Merge into a locale object
+const locale = {
+  lang: Object.assign({
+    placeholder: 'Wybierz datę',
+    rangePlaceholder: ['Data początkowa', 'Data końcowa'],
+    yearFormat: 'YYYY',
+    monthFormat: 'MMMM',
+    monthBeforeYear: true,
+    shortWeekDays: ['Niedz', 'Pon', 'Wt', 'Śr', 'Czw', 'Pt', 'Sob'],
+    shortMonths: ['Sty', 'Lut', 'Mar', 'Kwi', 'Maj', 'Cze', 'Lip', 'Sie', 'Wrz', 'Paź', 'Lis', 'Gru']
+  }, 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;