laravel/resources/lang/en/passwords.php

<?php

return [

    /*
    |--------------------------------------------------------------------------
    | Password Reminder Language Lines
    |--------------------------------------------------------------------------
    |
    | The following language lines are the default lines which match reasons
    | that are given by the password broker for a password update attempt
    | has failed, such as for an invalid token or invalid new password.
    |
    */

    "password" => "Passwords must be at least six characters and match the confirmation.",
    "user" => "We can't find a user with that e-mail address.",
    "token" => "This password reset token is invalid.",
    "sent" => "We have e-mailed your password reset link!",
    "reset" => "Your password has been reset!",

];