Unfortunately this modification did not worked (we’ve double checked – file on our FTP servers has been uploaded after the modification 😉
This is our changed line 44:
$output .= '<p><label>' . esc_html__('Name *', 'mo_theme') . '</label><input type="text" name="contact_name" minlength="2" placeholder="' . esc_attr__("Name:", 'mo_theme') . '" class="text-input" required></p>';