[Improvement] translate Area component (#440)

docs/demos/views/area.vue

@@ -1,31 +1,34 @@
 <template>
   <demo-section>
     <demo-block :title="$t('basicUsage')">
-      <van-area :areaList="areaList" />
+      <van-area :areaList="$t('areaList')" />
     </demo-block>
 
     <demo-block :title="$t('title2')">
-      <van-area :areaList="areaList" :value="value" />
+      <van-area :areaList="$t('areaList')" :value="value" />
     </demo-block>
 
     <demo-block :title="$t('title3')">
-      <van-area :areaList="areaList" :columnsNum="2" />
+      <van-area :areaList="$t('areaList')" :columnsNum="2" />
     </demo-block>
   </demo-section>
 </template>
 
 <script>
 import AreaList from '../mock/area.json';
+import AreaListEn from '../mock/areaEn.json';
 
 export default {
   i18n: {
     'zh-CN': {
       title2: '选中省市县',
-      title3: '配置显示列'
+      title3: '配置显示列',
+      areaList: AreaList
     },
     'en-US': {
       title2: 'Initial Value',
-      title3: 'Columns Number'
+      title3: 'Columns Number',
+      areaList: AreaListEn
     }
   },