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/dropzone.vue

@@ -1,8 +1,8 @@
 <template>
   <div class="components-container">
     <code>
-      基于<a class="link-type" href="https://github.com/rowanwins/vue-dropzone"> dropzone </a>封装 ,
-      由于我司业务有特殊需求，而且要传七牛 所以没用第三方 选择了自己封装
+      Based on <a class="link-type" href="https://github.com/rowanwins/vue-dropzone"> dropzone </a>.
+      {{$t('components.dropzoneTips')}}
     </code>
     <div class="editor-container">
       <dropzone v-on:dropzone-removedFile="dropzoneR" v-on:dropzone-success="dropzoneS" id="myVueDropzone" url="https://httpbin.org/post"></dropzone>
@@ -19,11 +19,11 @@ export default {
   methods: {
     dropzoneS(file) {
       console.log(file)
-      this.$message({ message: '上传成功', type: 'success' })
+      this.$message({ message: 'Upload success', type: 'success' })
     },
     dropzoneR(file) {
       console.log(file)
-      this.$message({ message: '删除成功', type: 'success' })
+      this.$message({ message: 'Delete success', type: 'success' })
     }
   }
 }