fix bug under the condition of moment.locale("zh-cn")

[jonChen003]

When I set moment.locale('zh-cn'), some problems are met on the panel of month. All months are selected. The pr is to solve this problem.

[mvachette]

I encoutered the same bug, and I can propose a more simple solution, (based on the code used for "day" panel)

//Month.jsx
   render() {
     const _moment = this.state.moment;
-    const months = MONTHS;
+    const {months = MONTHS} = this.props;
     const {changePanel, style} = this.props;