<?php the_title( sprintf( '<h2 class="entry-title h2"><a href="%s">'.herald_post_format_icon(), esc_url( get_permalink() ) ), '</a></h2>' ); ?>

<?php if( get_field('alt_title_article') ): ?>
      <h2 class="entry-title h2"><?php the_field('alt_title_article'); ?></h2>
<?php else : ?>
      <?php the_title( sprintf( '<h2 class="entry-title h2"><a href="%s">'.herald_post_format_icon(), esc_url( get_permalink() ) ), '</a></h2>' ); ?>
<?php endif; ?>

<?php echo $ICO_result . get_field('alt_title_article'); ?>

<h2 class="entry-title h2">
    <a href="<?php the_permalink() ?>">
        <?php echo herald_post_format_icon() . ( get_field( 'alt_title_article' ) ?: get_the_title() ) ?>
    </a>
</h2>