Extend qTranslate Slug for WordPress to automatically generate slugs qTranslate-X

functions.php

<?php

add_action('admin_footer', 'qtranslate_slug_snippet');
function qtranslate_slug_snippet() {
?>
<script>
function string_to_slug(str) {
	str = str.replace(/^\s+|\s+$/g, ''); // trim
	str = str.toLowerCase();

	// remove accents, swap ñ for n, etc
	var from = 'àáäâèéëêìíïîòóöôùúüûñç·/_,:;';
	var to   = 'aaaaeeeeiiiioooouuuunc------';
	for (var i=0, l=from.length; i < l; i++) {
		str = str.replace(new RegExp(from.charAt(i), 'g'), to.charAt(i));
	}

	str = str.replace(/[^a-z0-9 -]/g, '') // remove invalid chars
		.replace(/\s+/g, '-') // collapse whitespace and replace by -
		.replace(/-+/g, '-'); // collapse dashes

	return str;
}

// slugify qtranslate titles and insert them into qtranslate slug inputs
jQuery(document).on('keyup', '#title', function() {
	var locale = jQuery('.qtranxs-lang-switch.active').attr('lang');
	var slug = string_to_slug(jQuery(this).val());
	jQuery('#qts_'+locale+'_slug').val(slug);
});
</script>
<?php
}