FE: add clear sources functionality in multi-edit

Signed-off-by: jokob-sk <jokob.sk@gmail.com>

front/php/templates/language/zh_cn.json

@@ -427,6 +427,9 @@
     "Maintenance_Tool_backup_noti_text": "您确定要执行数据库备份吗？请确保当前没有正在运行的扫描。",
     "Maintenance_Tool_backup_text": "数据库备份以 zip 存档形式位于数据库目录中，以创建日期命名。备份数量没有上限。",
     "Maintenance_Tool_check_visible": "取消选择隐藏列。",
+    "Maintenance_Tool_clearSourceFields_selected": "",
+    "Maintenance_Tool_clearSourceFields_selected_noti": "",
+    "Maintenance_Tool_clearSourceFields_selected_text": "",
     "Maintenance_Tool_darkmode": "切换模式（暗/亮）",
     "Maintenance_Tool_darkmode_noti": "切换模式",
     "Maintenance_Tool_darkmode_noti_text": "主题切换后，页面会尝试重新加载以激活更改。如有必要，必须清除缓存。",
@@ -786,4 +789,4 @@
     "settings_system_label": "系统",
     "settings_update_item_warning": "更新下面的值。请注意遵循先前的格式。<b>未执行验证。</b>",
     "test_event_tooltip": "在测试设置之前，请先保存更改。"
-}
+}