fix(系统设置): 设置自定义字段弹窗标题显示错误

--bug=1010595 --user=李玉号 【系统设置】设置自定义字段弹窗标题显示错误
https://www.tapd.cn/55049933/s/1113227

frontend/src/business/components/settings/workspace/template/FieldTemplateEdit.vue

@@ -179,7 +179,7 @@ export default {
       this.$refs.customFieldRelateList.open();
     },
     addField() {
-      this.$refs.customFieldEdit.open();
+      this.$refs.customFieldEdit.open(null, this.$t('custom_field.create'));
     },
     getRelateFields() {
       let condition = {};