Hello I had the same problem. I solved it by using javascript:
1) I installed plugin “Insert Headers and Footers” (or other similar plugin that let you add javascript into footer of your sites)
2) I added script to footer
<script>
jQuery( function( $ ) {
$(‘.elementor-search-form’).submit(function (event) {
if(document.querySelector(‘.some-class’) !== null) {
$(‘.elementor-search-form’).prop(‘action’, ‘//www.somesite.com/langcode/’);
}
});
} );
</script>
3) I added class to specific search form (in my case into header_en template) elementor console —> Edit search form —> Advanced —> CSS classes
Hope this help someone…