perf: change default element-ui language to english (#2741)

src/main.js

@@ -6,6 +6,7 @@ import 'normalize.css/normalize.css' // a modern alternative to CSS resets
 
 import Element from 'element-ui'
 import './styles/element-variables.scss'
+import enLang from 'element-ui/lib/locale/lang/en'// 如果使用中文语言包请默认支持，无需额外引入，请删除该依赖
 
 import '@/styles/index.scss' // global css
 
@@ -33,7 +34,8 @@ if (process.env.NODE_ENV === 'production') {
 }
 
 Vue.use(Element, {
-  size: Cookies.get('size') || 'medium' // set element-ui default size
+  size: Cookies.get('size') || 'medium', // set element-ui default size
+  locale: enLang // 如果使用中文，无需设置，请删除
 })
 
 // register global utility filters