fix: 1、修复customize只保留最后一项点击空白处，再打开customize新增选项，上次禁用的项还存在的问题；2、表格某一列数据为空时，添加-避免界面展示空白

src/components/table/administration/I18nTable.vue

@@ -33,7 +33,7 @@
         <div class="col-resize-area"></div>
       </template>
       <template #default="scope" :column="item">
-        <span>{{scope.row[item.prop]}}</span>
+        <span>{{scope.row[item.prop] || '-'}}</span>
       </template>
     </el-table-column><template v-slot:empty >
     <div class="table-no-data" v-if="isNoData">