I would like to use the new WPML custom language switcher to put the flags inside subheader (near the social icons) instead of main menu, to have flags always visible in mobile view.

Where should I put the do_action('wpml_add_language_selector');?

I tried many places but the flags always goes on a new line instead of on the right where I would like them to stay.

Thank you

May I see your URL please? Put it in the header.php template in your Child theme, somewhere within the div class="subheader_inside".
Most likely you just need to style it with CSS a bit, I could help with that.

I tried to put the WPML code after social icons (where I would like the flags to show):

	<div class="subheader_inside">
							
						<?php if(ot_get_option('show_search','on') == 'on'){?>	
							<div class="header_search">
								<form class="search" action="<?php echo home_url(); ?>/" method="get">
									<button class="button_search"></button>
									<input name="s" id="s" type="text" placeholder="<?php echo ($s ? $s : __('Search', 'Savia').'...'); ?>" value="" />
								</form>
							</div>
						<?php }  ?>
							
						<?php if(is_array($header_icons = ot_get_option('header_icons'))){
									$header_icons = array_reverse($header_icons);							
									foreach($header_icons as $header_icon){
										echo "<a target='_blank' href='". ( $header_icon['icons_service']!='rss' ? $header_icon['icons_url'] : get_bloginfo('rss2_url') )."' class='header_soc_". $header_icon['icons_service'] ."' title='". $header_icon['title'] ."'>". $header_icon['icons_service'] ."</a>";			
									} do_action('wpml_add_language_selector');
								}
						?>
						
						<?php $header_contacts_position = ot_get_option('header_contacts_position'); ?>	
<a href="http://www.gallerinihotels.com"><img style="vertical-align:middle" border="0" src="http://www.gallerinihotels.com/wp-content/uploads/2015/05/logo_Gallerini_HOTELS-26.png" /></a>							<div class="header_contacts" <?php echo (!$header_contacts_position? " style='float: right;'": '');?>>
								
								<?php if($header_email = ot_get_option('header_email')){?>
									<div class="header_mail"><?php echo $header_email;?></div>
								<?php }  ?>	
								<?php if($header_phone = ot_get_option('header_phone')){?>
									<div class="header_phone"><?php echo $header_phone;?></div>
								<?php }  ?>
							</div>
						</div>

This is a screenshot of the result, it’s a live site and I don’t want to keep it online

http://prnt.sc/e0jf1o

Original sub header:

http://prnt.sc/e0jfrt

Thank you

I restored the code in header so you can have a look.

I attach a makeup of the final result:

http://prnt.sc/e2rkx6

Thank you

.wpml-ls-legacy-list-horizontal {
    border: 1px solid transparent;
    padding: 0 0 0 12px !important;
    float: right;
}

Thanks Kal, amazing support as always!

.subheader_inside a has a transition that makes the flags move a little.

What is this for?