<header>
    <h1><?php echo w_template_title(); ?></h1>
    <?php if (category_description()) :?>
        <h2><?php echo category_description(); ?></h2>
    <?php endif; ?>
</header>

<?php if (have_posts()) : ?>
    <?php while (have_posts()) : ?>
        <?php the_post(); ?>
        <?php get_template_part('partials/article-list-item'); ?>
    <?php endwhile; ?>
<?php endif; ?>

<div class="pager">
    <?php get_template_part('partials/pager') ?>
</div>

<header>
    <h1><?php echo h()->w_template_title(); ?></h1>
    <?php if (category_description()) :?>
        <h2><?php echo category_description(); ?></h2>
    <?php endif; ?>
</header>

<?php if (have_posts()) : ?>
    <?php while (have_posts()) : ?>
        <?php the_post(); ?>
        <?php get_template_part('partials/article-list-item'); ?>
    <?php endwhile; ?>
<?php endif; ?>

<div class="pager">
    <?php get_template_part('partials/pager') ?>
</div>

Update w_template_title() to be h()->w_template_title()
Update w_template_title() to be h()->w_template_title()
