Hi Matthias,
Please disregard previously suggested solution.
You can add this code in your child theme’s functions.php file instead.
function add_topbar() {
?>
<div class="my-top-bar">
<div class="my-search"><?php get_search_form(); ?></div>
<div class="my-language-switcher"><?php language_selector_flags(); ?></div>
</div>
<?php
}
add_action( 'x_before_view_global__slider-above', 'add_topbar', 10 );
Assuming you have wpml installed for the translations, if you are using a different plugin you need to replace language_selector_flags(); with their own code.
After that add this in Appearance > Customize > Custom > Edit Global CSS
.my-top-bar {
display:block;
width:100%;
}
.my-search,
.my-language-switcher {
display:inline-block;
}
Hope that helps.