Diamonds queston in menu

Hi,

I′m creating one page website https://startupweb.sk/ with only one page in dashboard menu. In header.php I don′t use wp code for menu

<?php
$args = array (
‘theme_location’ => ‘primary’
);
?>

but normally html ul list items:

<div class=”top-menu”>

• Kto sme
• ?o robíme
• Portfólio
• Kontakt

</div>

For language I use html meta tag

<meta http-equiv=”content-type” content=”text/html; charset=utf-8″ />

but diamond question appear instead of letter with punctuation. I don′t know what should I do.

Thanks for help