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/utils/clipboard.js

@@ -3,7 +3,7 @@ import Clipboard from 'clipboard'
 
 function clipboardSuccess() {
   Vue.prototype.$message({
-    message: '复制成功',
+    message: 'Copy successfully',
     type: 'success',
     duration: 1500
   })
@@ -11,7 +11,7 @@ function clipboardSuccess() {
 
 function clipboardError() {
   Vue.prototype.$message({
-    message: '复制失败',
+    message: 'Copy failed',
     type: 'error'
   })
 }