nodered_cfg/node_modules/node-red-dashboard/nodes/locales/en-US/ui_group.json

{
    "ui_group" : {
        "label" : {
            "name" : "Name",
            "tab" : "Tab",
            "width" : "Width",
            "default" : "Default",
            "group" : "Group",
            "unassigned" : "unassigned",
            "className": "Class",
            "classNamePlaceholder": "Optional CSS class name(s) for widget"
        },
        "display-name" : "Display group name",
        "collapse-name" : "Allow group to be collapsed"
    }
}