Nově napsaný PHP Formulář, ale mám 2 problémy, prosím o radu

<form method="POST" action="feedback-form-cs.php">

Jmeno:&nbsp;<input type="text" name="name" size="40" required><br>
E-mail:&nbsp;&nbsp;<input type="text" name="email" size="40" required><br>
Zprava:<br>
<textarea name="comment" cols="60" rows="10" required></textarea><br>

<input type="submit" value="Odeslat">
</form>

<?php
ob_start();
/*
    1. Check, if all variables was sent
    2. Prepare mail to send
    3. Send mail
    4.
        a) Show system message of success or failure
      or
        b) redirect to the success/failure page
*/

/* CONFIGURATION : start */

$adminEmail = 'MUJMEJL@halo.cz';

$subject = "Website Feedback";
$messages['cz'] = array(
    'systemSuccessMessage' => "Děkuji - vaše zpráva byla odeslána.",
    'emailErrorMessage' => "Něco se nepovedlo a vaše zpráva nebyla odeslána. Zkuste prosím znovu.",
    'dataErrorMessage' => "Vyplňte prosím všechny údaje.",
    );
$messages['en'] = array(
    'systemSuccessMessage' => "Thank you! Your message has been sent.",
    'emailErrorMessage' => "Something went wrong and your message was not sent. Please try again.",
    'dataErrorMessage' => "Please fill in all the fields.",
    );

$links['cz'] = array(
    'goback' => 'Go to Home page',
    'contactForm' => 'Back to Contact form',
);
$links['en'] = array(
    'goback' => 'Go to Home page',
    'contactForm' => 'Back to Contact form',
);

define('SEND_WITH_ERRORS', false); // true, if you want to have an email sent despite incomplete form, false, if you don't

/* CONFIGURATION : end  - DONT CHANGE ANYTHING BELOW */

$error = false; // no error at this point
$errorMessage = ''; // we need these two variables set before we use them anywhere later

    
// default language to use
$lang = 'en';

// what language we want to use
if(isset($_POST['form']['lang'])) {
    switch($_POST['form']['lang']) {
        // if the case the form was sent from the czeck form
        case 'cz':
            $lang = 'cz';
        break;
        
        // otherwise
        default:
            $lang = 'en';
        break;
    }
}


/**
 * It sends email with information got in the form
 * 
 * @param array Data retrieved from the user
 * @return true or error message
 */
function sendEmail($f, $withErrors = false) {
    // we need to get configuration variables into the function
    global $subject, $messages, $adminEmail, $lang;
    
    // we want to read this email in UTF-8 (all special language characters) and as a plain text
    $headers = "MIME-Version: 1.0" . "\r\n" . 
               "Content-type: text/plain; charset=UTF-8" . "\r\n"; 
    
    $message = "
Name: " . $f['name'] ."\r\n
E-mail: " . $f['email'] ."\r\n
Message: \r\n
" . $f['comment'] . "
";
    
    $result = mail($adminEmail, $subject, $message, $headers);
    
    if($result) {
        return TRUE;
    }
    else {
        return $messages[$lang]['emailErrorMessage'];
    }
}

if(isset($_POST)) { // check if the form was sent by POST method
    if(isset($_POST['form'])) {
        // the form was sent, because our new variable (array) is set
        $f = $_POST['form']; // local variable $f as a shortcut to the $_POST['form'] array
        
        // isset checks if there is key 'name' in the array
        // strlen checks how long is the variable set under 'name' key - if at least 1 (one) sign is typed, than it returns true
        if(isset($f['name']) && strlen($f['name']) > 0 && isset($f['email']) && strlen($f['email']) > 0 && isset($f['comment']) && strlen($f['comment']) > 0) {
            // if all of these return true (all of them at the same time - thanks to '&&' operator, which means AND) then we have all data we need in order to send an email to the administrator
            
            // send email - we use a function to make the code more clear
            
            $result = sendEmail($f); // as a parameter we give all array with all the data
            
            if($result === true) { // we check what the function returned and act on that
                // all went well, when the function returned EXACTLY TRUE
            }
            else {
                // something is wrong and we would get our message in the $result variable
                $error = true;
                $errorMessage = $result;
            }
        }
        else {
            $error = true;
            if(SEND_WITH_ERRORS) {
                sendEmail($f, SEND_WITH_ERRORS);
            }
            $errorMessage = $messages[$lang]['dataErrorMessage'];
            $location = ($lang == 'cz') ? 'kontakt.php' : 'contact.php';
            header('Location: ' . $location . '?error=1');
            exit();
        }
    }
    else {
        // the form was not sent
        $error = true;
    }
}
else {
    $error = true; // no $_POST set = no form sent by POST method
}

$systemMessage = '';

if($error) {
    // error occured
    
    if(!isset($errorMessage) || strlen($errorMessage) == 0) {
        $errorMessage = $messages[$lang]['emailErrorMessage'];
    }
    
    // show error messsage
    $systemMessage = $errorMessage;
}
else {
    $systemMessage = $messages[$lang]['systemSuccessMessage'];
}
ob_end_flush();
?><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>

<head>
<title><?php echo $systemMessage; ?></title>
<meta name="robots" content="noindex">
<meta http-equiv="Content-Language" content="en">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<link rel="shortcut icon" href="favicon.ico" type="image/x-icon">
<link rel="icon" href="img/favicon.ico" type="image/x-icon">
</head>

<body>
<br>

<?php echo $systemMessage; ?>

<br>

<?php if($lang == 'cz') { ?>
    <input onclick="location.href='http://vanishingworldphotography.com/cs-index.html';" type="button" value="Přejít na Hlavní stránku">&nbsp;&nbsp;&nbsp;
    <input onclick="location.href='http://vanishingworldphotography.com/kontakt.html';" type="button" value="Zpět na Kontaktní formulář">
<?php } else if($lang == 'en') { ?>
    <input onclick="location.href='http://vanishingworldphotography.com/';" type="button" value="Go to Home page">&nbsp;&nbsp;&nbsp;
    <input onclick="location.href='http://vanishingworldphotography.com/contact.html';" type="button" value="Back to Contact form">
<?php } ?>

</body>

</html>

<?php
if(isset($_GET['error'])) {
    ?>
    <p class="error">Please fill in all the fields.</p>
    <?php
}
?>

<form method="POST" action="feedback-form.php">

Name:&nbsp;&nbsp;<input type="text" name="form[name]" size="40" required><br>
E-mail:&nbsp;<input type="text" name="form[email]" size="40" required><br>
Comments:<br>
<textarea name="form[comment]" cols="60" rows="10" required></textarea><br>

<input type="hidden" name="form[lang]" value="en" />
<input type="submit" value="Submit">
</form>

<?php
if(isset($_GET['error'])) {
    ?>
    <p class="error">Please fill in all the fields.</p>
    <?php
}
?>