Change texts with script
<script>
$('.delivery-time-label').text('U vás:');
$('.top-products-wrapper h4 > span').text('TOP 5 produktů');
$('.co-box.co-billing-address > .box.box-sm.box-bg-default > h4').text('Vaše adresa');
$('.box.box-sm.box-bg-default.co-box.co-contact-information > div > div > .btn.btn-secondary').text('Chcem sa prihlásiť');
$('.box.box-sm.box-bg-default.co-box.co-contact-information > div > label[for=email]').html('Váš email <span class="red"><strong>*</strong></span>');
$('.box.box-sm.box-bg-default.co-box.co-contact-information > div > label[for=phone]').html('Váš telefón <span class="red"><strong>*</strong></span>');
$('.co-box.co-billing-address h4').text('VAŠA ADRESA');
$('.btn.btn-conversion.next-step-finish').text('Odoslať objednávku');
</script>