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/splitpane.vue

@@ -1,9 +1,9 @@
 <template>
   <div class="components-container">
-    <code>splitPane 如果你用过
+    <code><strong>SplitPane</strong> If you've used
       <a href="http://codepen.io/" target="_blank"> codepen</a>,
-      <a href="https://jsfiddle.net/" target="_blank"> jsfiddle </a>就不会陌生了
-      <a href="https://github.com/PanJiaChen/vue-split-pane" target='_blank'>项目地址</a>
+      <a href="https://jsfiddle.net/" target="_blank"> jsfiddle </a>will not be unfamiliar.
+      <a href="https://github.com/PanJiaChen/vue-split-pane" target='_blank'> Github repository</a>
     </code>
     <split-pane v-on:resize="resize" split="vertical">
       <template slot="paneL">