Feature/english (#381)

* perf[navbar]: set langSelect to component && refine errorLog component

* feat[login]:add 18n to login form

* fix[pagination]: fixed when selected page-sizes

* perf[i18n]:dashboard document svg permission

* perf[charts]: perf effect

* perf[i18n]:excel && zip

* perf[i18n]: table && errorLog && theme

* perf[i18n]: components

* perf[i18n]: direct use $t

* perf[i18n]: complex-table

* update README.md

* update README.md 📘

* perf[i18n]: refine code comments

src/views/example/table/dynamicTable/fixedThead.vue

@@ -11,7 +11,7 @@
 
     <el-table :data="tableData" :key='key' border fit highlight-current-row style="width: 100%">
       <el-table-column prop="name" label="fruitName" width="180"></el-table-column>
-      <el-table-column :key='fruit' v-for='(fruit,index) in formThead' :label="fruit">
+      <el-table-column :key='fruit' v-for='fruit in formThead' :label="fruit">
         <template slot-scope="scope">
           {{scope.row[fruit]}}
         </template>
@@ -22,7 +22,7 @@
 </template>
 
 <script>
-const defaultFormThead = ['apple', 'banana'] // 默认选中项
+const defaultFormThead = ['apple', 'banana']
 
 export default {
   data() {
@@ -42,15 +42,15 @@ export default {
         }
       ],
       key: 1, // table key
-      formTheadOptions: ['apple', 'banana', 'orange'], // 可选择表头
+      formTheadOptions: ['apple', 'banana', 'orange'],
       checkboxVal: defaultFormThead, // checkboxVal
-      formThead: defaultFormThead // 默认表头
+      formThead: defaultFormThead // 默认表头 Default header
     }
   },
   watch: {
     checkboxVal(valArr) {
       this.formThead = this.formTheadOptions.filter(i => valArr.indexOf(i) >= 0)
-      this.key = this.key + 1// 为了保证table 每次都会重渲 （牺牲性能保证效果，当然也可以不用）
+      this.key = this.key + 1// 为了保证table 每次都会重渲 In order to ensure the table will be re-rendered each time
     }
   }
 }