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/svg-icons/index.vue

@@ -1,7 +1,8 @@
 <template>
   <div class="icons-container">
     <p class="warn-content">
-      <a href="https://panjiachen.github.io/vue-element-admin-site/#/icon" target="_blank">添加和使用方式</a>
+      <a href="https://panjiachen.github.io/vue-element-admin-site/#/icon" target="_blank">Add and use
+      </a>
     </p>
     <div class="icons-wrapper">
       <div v-for="item of iconsMap" :key="item" @click="handleClipboard(generateIconCode(item),$event)">