feat: add blacklist description text

mail-vue/src/i18n/en.js

@@ -315,6 +315,7 @@ const en = {
     blackSubjectDesc: 'Subject',
     blackContentDesc: 'Content',
     blackFromDesc: 'Sender or domain',
+    blackListDesc: 'Reject emails containing the following information',
     setSuccess: 'Settings saved successfully',
     details: 'Details',
     userDetails: 'User Details',

mail-vue/src/i18n/zh.js

@@ -315,6 +315,7 @@ const zh = {
     blackSubjectDesc: '邮件标题',
     blackContentDesc: '邮件内容',
     blackFromDesc: '发件人邮箱或域名',
+    blackListDesc: '拒收包含以下信息的邮件',
     setSuccess: '设置成功',
     details: '详情',
     userDetails: '用户详情',

mail-vue/src/views/sys-setting/index.vue

@@ -737,7 +737,15 @@
         </div>
         <el-button type="primary" style="width: 100%;" :loading="settingLoading" @click="saveEmailPrefix">{{ $t('save') }}</el-button>
       </el-dialog>
-      <el-dialog v-model="blackFormShow" :title="t('blackList')" class="forward-dialog" @closed="resetBlackList">
+      <el-dialog v-model="blackFormShow" class="forward-dialog" @closed="resetBlackList">
+        <template #header>
+          <div class="forward-head">
+            <span class="forward-set-title">{{ $t('blackList') }}</span>
+            <el-tooltip effect="dark" :content="$t('blackListDesc')">
+              <Icon class="warning" icon="fe:warning" width="18" height="18"/>
+            </el-tooltip>
+          </div>
+        </template>
         <el-form>
           <el-form-item :label="t('blackFromDesc')" label-position="top">
             <el-input-tag v-model="blackListForm.blackFrom" @add-tag="banEmailAddTag"  />