HUSKY - WooCommerce Products Filter Professional

Hook woof_filter_title (since v.3.3.6) all headings of both taxonomy and meta filters pass through this filter, so you can translate headings in your own way, code example:

add_filter('woof_filter_title', function($title, $tax_info, $index) {
    if (is_object($tax_info) && $tax_info->name == 'pa_size') {
        $title = '尺寸'; // Chinese characters for "size"
    }

    return $title;
}, 10, 3);