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/layout/components/Navbar.vue

@@ -7,13 +7,13 @@
     <div class="right-menu">
       <error-log class="errLog-container right-menu-item"></error-log>
 
-      <el-tooltip effect="dark" content="全屏" placement="bottom">
+      <el-tooltip effect="dark" :content="$t('navbar.screenfull')" placement="bottom">
         <screenfull class="screenfull right-menu-item"></screenfull>
       </el-tooltip>
 
       <lang-select class="international right-menu-item"></lang-select>
 
-      <el-tooltip effect="dark" content="换肤" placement="bottom">
+      <el-tooltip effect="dark" :content="$t('navbar.theme')" placement="bottom">
         <theme-picker class="theme-switch right-menu-item"></theme-picker>
       </el-tooltip>
 
@@ -25,16 +25,16 @@
         <el-dropdown-menu slot="dropdown">
           <router-link to="/">
             <el-dropdown-item>
-              首页
+              {{$t('navbar.dashboard')}}
             </el-dropdown-item>
           </router-link>
           <a target='_blank' href="https://github.com/PanJiaChen/vue-element-admin/">
             <el-dropdown-item>
-              项目地址
+              {{$t('navbar.github')}}
             </el-dropdown-item>
           </a>
           <el-dropdown-item divided>
-            <span @click="logout" style="display:block;">退出登录</span>
+            <span @click="logout" style="display:block;">{{$t('navbar.logOut')}}</span>
           </el-dropdown-item>
         </el-dropdown-menu>
       </el-dropdown>
@@ -73,7 +73,7 @@ export default {
     },
     logout() {
       this.$store.dispatch('LogOut').then(() => {
-        location.reload()// 为了重新实例化vue-router对象 避免bug
+        location.reload()// In order to re-instantiate the vue-router object to avoid bugs
       })
     }
   }