[Plugin: New User Approve] Editing the Approved message

There’s the function:

/**
* Admin approval of user
*
* @uses new_user_approve_approve_user
*/
public function approve_user( $user_id ) {
$user = new WP_User( $user_id );

// password should only be reset for users that:
// * have never logged in
// * are just approved for the first time

// If the password has already been reset for this user,
// $password_reset will be a unix timestamp
$password_reset = get_user_meta( $user_id, ‘pw_user_approve_password_reset’ );

// Get the current user status. By default each user is given a pending
// status when the user is created (with this plugin activated). If the
// user was created while this plugin was not active, the user will not
// have a status set.
$user_status = get_user_meta( $user_id, ‘pw_user_status’ );

// Default behavior is to reset password
$bypass_password_reset = false;

// if no status is set, don’t reset password
if ( empty( $user_status ) ) {
$bypass_password_reset = true;
}

// if the password has already been reset, absolutely bypass
if ( !empty( $password_reset ) ) {
$bypass_password_reset = true;
}

$bypass_password_reset = apply_filters( ‘new_user_approve_bypass_password_reset’, $bypass_password_reset );

if ( !$bypass_password_reset ) {
global $wpdb;

// reset password to know what to send the user
$new_pass = wp_generate_password( 12, false );
$data = array( ‘user_pass’ => md5( $new_pass ), ‘user_activation_key’ => ”, );
$where = array( ‘ID’ => $user->ID, );
$wpdb->update( $wpdb->users, $data, $where, array( ‘%s’, ‘%s’ ), array( ‘%d’ ) );

// Set up the Password change nag.
update_user_option( $user->ID, ‘default_password_nag’, true, true );

// Set this meta field to track that the password has been reset by
// the plugin. Don’t reset it again.
update_user_meta( $user->ID, ‘pw_user_approve_password_reset’, time() );
}

wp_cache_delete( $user->ID, ‘users’ );
wp_cache_delete( $user->data->user_login, ‘userlogins’ );

// send email to user telling of approval
$user_login = stripslashes( $user->data->user_login );
$user_email = stripslashes( $user->data->user_email );

// format the message
$message = sprintf( __( ‘You have been approved to access %s’, ‘new-user-approve’ ), get_option( ‘blogname’ ) ) . “\r\n”;
$message .= sprintf( __( ‘Username: %s’, ‘new-user-approve’ ), $user_login ) . “\r\n”;
if ( !$bypass_password_reset ) {
$message .= sprintf( __( ‘Password: %s’, ‘new-user-approve’ ), $new_pass ) . “\r\n”;
}
$message .= wp_login_url() . “\r\n”;

$message = apply_filters( ‘new_user_approve_approve_user_message’, $message, $user );

$subject = sprintf( __( ‘[%s] Registration Approved’, ‘new-user-approve’ ), get_option( ‘blogname’ ) );
$subject = apply_filters( ‘new_user_approve_approve_user_subject’, $subject );

// send the mail
wp_mail( $user_email, $subject, $message, $this->email_message_headers() );

// change usermeta tag in database to approved
update_user_meta( $user->ID, ‘pw_user_status’, ‘approved’ );

do_action( ‘new_user_approve_user_approved’, $user );
}

I want to edit the approval message, but I don’t want to change it in the plugin file. Is there a function I can add to edit this message?