How to localize 'sum of' field in Chinese Completed

<template>
  <div>
    <div class="config-button-container">
      <ejs-button  v-on:click.native="btnClick">Show Field List</ejs-button>
      <ejs-button  v- on:click.native="btnClickExcel">Excel Export</ejs-button>
    </div>
    <ejs-pivotview
      class="cusStyle"
      locale="ch"
      :allowExcelExport="true"
      ref="gzj" id="pivotview_flist"
      :height="height"
      :cellClick="cellClick"
      :enginePopulated="enginePopulated"></ejs-pivotview>
    <ejs-pivotfieldlist
      cssClass="cusStyle"
      locale="ch"
      ref="pivotfieldlist1"
      id="pivotfieldlist1"
      :dataSourceSettings="dataSourceSettings"
      :enginePopulated="fieldEnginePopulated"
      :renderMode="renderMode"
      :allowDeferLayoutUpdate="false"></ejs-pivotfieldlist>
  </div>
</template>

<script>
  import Vue from "vue";
  import { PivotViewPlugin, PivotFieldListPlugin, FieldList } from "@syncfusion/ej2-vue-pivotview";
  import { ButtonPlugin} from "@syncfusion/ej2-vue-buttons";
  import { L10n} from '@syncfusion/ej2-base';

  Vue.use(PivotViewPlugin);
  Vue.use(PivotFieldListPlugin);
  Vue.use(ButtonPlugin);
  L10n.load({
    'ch': {
      'pivotview': {
        'grandTotal': '总计',
        'total': '全部的',
        'value': '值',
        'row': '行',
        'column': '列',
        'collapse': '关闭',
        'expand': '展开',
        'rowAxisPrompt': '在此处放置行',
        'columnAxisPrompt': '在此处放置列',
        'valueAxisPrompt': '在此处放置值',
        'filterAxisPrompt': '在此处放置筛选器',
        'filter': '筛选器',
        'filtered': '过滤',
        'sort': '排序',
        'filters': '筛选器',
        'delete': '删除',
        'columns': '列',
        'values': '值',
        'close': '关闭',
        'cancel': '取消',
        'calculatedField': '计算字段',
        'createCalculatedField': '创建计算字段',
        'fieldName': '字段名',
        'format': '按汇总值',
        'rows': '行'
      },
      "pivotfieldlist": {
        'fieldList': '字段列表',
        'centerHeader': '头部居中',
        'add': '加',
        'drag': '拖曳',
        'filters': '过滤器',
        'rows': '行',
        'columns': '列',
        'values': '结果',
        'error': '错误',
        'dropAction': '删除操作',
        'search': '搜索',
        'close': '关闭',
        'cancel': '取消',
        'delete': '删除',
        'alert': 'alert',
        'warning': '警告',
        'ok': '完成',
        'allFields': '所有字段',
        'noMatches': '无匹配项'
      }
    }
  });
  export default {
    data () {
      return {
        dataSourceSettings: {
          dataSource: [],
          expandAll: false,
          drilledMembers: [{ name: 'Year', items: ['FY 2015'] }],
          columns: [{ name: 'Year', caption: 'Production Year' },

                     { name:   'Quarter' }],
          values: [{ name: 'Sold', caption: 'Units Sold' },

                   { name: 'Amount', caption: 'Sold Amount' }],
          rows: [{ name: 'Country' }, { name: 'Products' }],
          // rows: [{ name: 'Country' }],
                    formatSettings: [{ name: 'Amount', format: 'C0' }],
          filters: []
                  },
        renderMode: 'Popup',
        height: 320,
        target: '#pivotfieldlist1',
        isPrimary: true
          }
   }

 }

  </script>

screenshot