Laravel validation error message show only short form

Question

I got used to request to validate before entering the API side function itself, but recently, when I moved the controller function to services then, the error message became like the below sample.

{
    "message": "validation.min.string",
    "errors": {
        "password": [
            "validation.min.string"
        ]
    }
}

But when I use the same way build in the new project, the error message show as usual as below

{
    "message": "The name must only contain letters.",
    "errors": {
        "name": [
            "The name must only contain letters."
        ]
    }
 }

I found that I had added an en language file under res resources\lang\en, which caused this issue, so may I know how I can change back to this version without removing the en file? Thanks