perf: 统一dashboard页面，去掉email签名设置

src/components/IBox/HeadingIBox.vue

@@ -1,6 +1,6 @@
 <template>
   <IBox v-bind="$attrs">
-    <div class="ibox-heading">
+    <div v-if="contentHeading" class="ibox-heading">
       <slot name="content-heading">
         <h3 v-if="contentHeading.title"><i v-if="contentHeading.fa" :class="'fa ' + contentHeading.fa" /> {{ contentHeading.title }}</h3>
         <small v-if="contentHeading.content"><i class="fa fa-tim" /> {{ contentHeading.content }}</small>
@@ -18,7 +18,7 @@ export default {
   props: {
     contentHeading: {
       type: Object,
-      default: () => ({})
+      default: null
     }
   }
 }

src/views/dashboard/TopAndLatestSummary/Latest10Sessions.vue

@@ -1,5 +1,5 @@
 <template>
-  <HeadingIBox :title="title" :content-heading="contentHeading">
+  <HeadingIBox :title="title">
     <div v-if="dates_login_record_top10_sessions.length > 0" class="feed-activity-list">
       <div v-for="(item, index ) of dates_login_record_top10_sessions" :key="item.user + index" class="feed-element">
         <a href="#" class="pull-left">
@@ -26,10 +26,6 @@ export default {
     return {
       title: this.$t('dashboard.LatestSessions10'),
       avatarUrl: require('@/assets/img/admin.png'),
-      contentHeading: {
-        title: this.$t('dashboard.LatestTop10'),
-        content: this.$t('dashboard.LatestSessions')
-      },
       dates_login_record_top10_sessions: []
     }
   },

src/views/settings/Email/EmailContent.vue

@@ -31,7 +31,7 @@ export default {
       visible: false,
       fields: [
         'EMAIL_CUSTOM_USER_CREATED_SUBJECT', 'EMAIL_CUSTOM_USER_CREATED_HONORIFIC',
-        'EMAIL_CUSTOM_USER_CREATED_BODY', 'EMAIL_CUSTOM_USER_CREATED_SIGNATURE'
+        'EMAIL_CUSTOM_USER_CREATED_BODY'
       ],
       successUrl: { name: 'Settings', params: { activeMenu: 'EmailContent' }},
       fieldsMeta: {