DatePicker: use the shorthand month, fixed #2792

src/locale/lang/en.js

@@ -13,18 +13,18 @@ export default {
       endDate: 'End Date',
       endTime: 'End Time',
       year: '',
-      month1: 'January',
-      month2: 'February',
-      month3: 'March',
-      month4: 'April',
+      month1: 'Jan',
+      month2: 'Feb',
+      month3: 'Mar',
+      month4: 'Apr',
       month5: 'May',
-      month6: 'June',
-      month7: 'July',
-      month8: 'August',
-      month9: 'September',
-      month10: 'October',
-      month11: 'November',
-      month12: 'December',
+      month6: 'Jun',
+      month7: 'Jul',
+      month8: 'Aug',
+      month9: 'Sep',
+      month10: 'Oct',
+      month11: 'Nov',
+      month12: 'Dec',
       // week: 'week',
       weeks: {
         sun: 'Sun',