The portfolio archive page uses the general <?php sketch_paging_nav(); ?>
so if you change the wording there, it will affect regular blog posts as well. I don’t see a blog on your site, though, so maybe that’s moot?
What you’d need to do is pull out the paging function and put it in your child theme’s functions.php.
Tweak My New Previous
and My New Next
to whatever you’d like.
function sketch_paging_nav( $max_num_pages = '' ) {
// Get max_num_pages if not provided
if ( '' == $max_num_pages )
$max_num_pages = $GLOBALS['wp_query']->max_num_pages;
// Don't print empty markup if there's only one page.
if ( $max_num_pages < 2 ) {
return;
}
?>
<nav class="navigation paging-navigation clear" role="navigation">
<h1 class="screen-reader-text"><?php _e( 'Posts navigation', 'sketch' ); ?></h1>
<div class="nav-links">
<?php if ( get_next_posts_link( '', $max_num_pages ) ) : ?>
<div class="nav-previous"><?php next_posts_link( __( '<span class="meta-nav">My New Previous</span>', 'sketch' ), $max_num_pages ); ?></div>
<?php endif; ?>
<?php if ( get_previous_posts_link( '', $max_num_pages ) ) : ?>
<div class="nav-next"><?php previous_posts_link( __( '<span class="meta-nav">My New Next</span>', 'sketch' ), $max_num_pages ); ?></div>
<?php endif; ?>
</div><!-- .nav-links -->
</nav><!-- .navigation -->
<?php
}
If you do plan to have a blog and the new wording won’t work for both, it is possible to create a new paging function just for the portfolio, but it’ll require a bit more code. Let me know how it goes and what you’d like to do.