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/components-demo/avatarUpload.vue

@@ -1,16 +1,16 @@
 <template>
   <div class="components-container">
-    <code>这里核心代码用的是
-      <a class="link-type" href="//github.com/dai-siki/vue-image-crop-upload"> vue-image-crop-upload</a>
-      由于我在使用时它只有vue@1版本，而且有些业务的需求耦合到七牛等等原因吧，自己改造了一下，如果大家要使用的话，优先还是使用官方component
+    <code>This is based on
+      <a class="link-type" href="//github.com/dai-siki/vue-image-crop-upload"> vue-image-crop-upload</a>.
+      {{$t('components.imageUploadTips')}}
     </code>
 
     <pan-thumb :image="image"></pan-thumb>
 
-    <el-button type="primary" icon="upload" style="position: absolute;bottom: 15px;margin-left: 40px;" @click="imagecropperShow=true">修改头像
+    <el-button type="primary" icon="upload" style="position: absolute;bottom: 15px;margin-left: 40px;" @click="imagecropperShow=true">Change avatar
     </el-button>
 
-    <image-cropper :width="300" :height="300" url="https://httpbin.org/post" @close='close' @crop-upload-success="cropSuccess"
+    <image-cropper :width="300" :height="300" url="https://httpbin.org/post" @close='close' @crop-upload-success="cropSuccess" langType="en"
       :key="imagecropperKey" v-show="imagecropperShow"></image-cropper>
   </div>
 </template>