display a message when a new about is saved

pages/about.vue

@@ -4,12 +4,14 @@
       Editor(v-if='$auth.user && $auth.user.is_admin'
         v-model='about')
       el-button.float-right(type='success' plain icon='el-icon-check'
-        @click='setSetting({key: "about", value: about})') {{$t('common.save')}}
+        @click='save') {{$t('common.save')}}
     div(v-else v-html='about')
 </template>
 <script>
 import Editor from '@/components/Editor'
 import { mapState, mapActions } from 'vuex'
+import { Message } from 'element-ui'
+
 export default {
   components: { Editor },
   data ({ $store }) {
@@ -18,7 +20,17 @@ export default {
     }
   },
   computed: mapState(['settings']),
-  methods: mapActions(['setSetting']),
+  methods: {
+    ...mapActions(['setSetting']),
+    save () {
+      Message({
+        showClose: true,
+        type: 'success',
+        message: this.$t('common.done')
+      })
+      this.setSetting({ key: 'about', value: this.about })
+    }
+  },
   head () {
     return {
       title: `${this.settings.title} - ${this.$t('common.info')}`