fix: 增加excel字段重复错误提示

backend/src/main/resources/i18n/messages_en_US.properties

@@ -260,3 +260,4 @@ i18n_sql_add_not_matching=The data column of incremental SQL does not match the
 i18n_sql_delete_not_matching=The data column of incremental delete SQL does not match the dataset,
 i18n_cst_ds_tb_or_field_deleted=Custom dataset union data is deleted or field changed,can not display
 i18n_no_all_delete_privilege_folder=This folder have sources which have no manage or view privilege,Can Not Be Deleted.
+i18n_excel_field_repeat=Excel exists repeat field，please fix and upload again.

backend/src/main/resources/i18n/messages_zh_CN.properties

@@ -259,3 +259,4 @@ i18n_sql_add_not_matching=增量添加 sql 的数据列与数据集不匹配,
 i18n_sql_delete_not_matching=增量删除 sql 的数据列与数据集不匹配, 
 i18n_cst_ds_tb_or_field_deleted=自定义数据集所关联数据被删除或字段发生变化，无法正常显示
 i18n_no_all_delete_privilege_folder=该目录下存在没有管理权限或查看权限的资源，无法删除
+i18n_excel_field_repeat=Excel存在重复字段，请修改后重新上传

backend/src/main/resources/i18n/messages_zh_TW.properties

@@ -262,3 +262,4 @@ i18n_sql_add_not_matching=增量添加 sql 的數據列與數據集不匹配,
 i18n_sql_delete_not_matching=增量刪除 sql 的數據列與數據集不匹配, 
 i18n_cst_ds_tb_or_field_deleted=自定義數據集所關聯數據被刪除或字段發生變化，無法正常顯示
 i18n_no_all_delete_privilege_folder=該目錄下存在沒有管理權限或查看權限的資源，無法刪除
+i18n_excel_field_repeat=Excel存在重復字段，請修改後重新上傳