feature[Vuex]: auto import vuex modules(#1815)

src/store/modules/app.js

@@ -1,4 +1,5 @@
 import Cookies from 'js-cookie'
+import { getLanguage } from '@/lang/index'
 
 const state = {
   sidebar: {
@@ -6,7 +7,7 @@ const state = {
     withoutAnimation: false
   },
   device: 'desktop',
-  language: Cookies.get('language') || 'en',
+  language: getLanguage(),
   size: Cookies.get('size') || 'medium'
 }