Hi. How can I remove language switcher from bottom of page, and add dropdown language switcher with flags in top of page, near the ''sign up" button. For example like a tatiana free theme

@Nail
You will have to remove it from footer.php and create new drop-down menu in header.php, this could be copied from tatiana theme (it's free) but you will have to create dropdown functionality in gamma, as it will not match to what is in tatiana.