fix: update German [de] locale yearStart

fix #1264

Author: iamkun

src/locale/de.js

@@ -32,6 +32,7 @@ const locale = {
   monthsShort: 'Jan_Feb_März_Apr_Mai_Juni_Juli_Aug_Sept_Okt_Nov_Dez'.split('_'),
   ordinal: n => `${n}.`,
   weekStart: 1,
+  yearStart: 4,
   formats: {
     LTS: 'HH:mm:ss',
     LT: 'HH:mm',