Calendar locale prop should have priority

close #12706

components/calendar/index.tsx

@@ -240,11 +240,23 @@ export default class Calendar extends React.Component<CalendarProps, CalendarSta
     );
   }
 
+  getDefaultLocale = () => {
+    const result = {
+      ...enUS,
+      ...this.props.locale,
+    };
+    result.lang = {
+      ...result.lang,
+      ...(this.props.locale || {}).lang,
+    };
+    return result;
+  }
+
   render() {
     return (
       <LocaleReceiver
         componentName="Calendar"
-        defaultLocale={enUS}
+        defaultLocale={this.getDefaultLocale}
       >
         {this.renderCalendar}
       </LocaleReceiver>