Next post form same category?

Not really, those links are handled directly by WordPress and there’s little control in regards to what they link to.

Anyway, I don’t recommend using categories for different languages. Instead use a plugin like WPML or qTranslate.

It only allows you to modify the link text, not the URL it points to.

I believe you are making a confusion. Tat function is next_post_link();, which displays a link to the next post INSIDE the post you are currently reading. It’s not paged navigation for post archived. The function for that is next_posts_link(); (minor difference). If what you are looking for is inner post navigation, then all you have to do is add a third parameter , TRUE like in the example. You’ll still have to edit the file manually.

Thank you, it is clear now.

In functions.php you’ll find the function esplanade_post_nav();

In that function you can find the 2 functions that display the next/previous post links. You just need to add a third parameter true to them and they will behave as you desire.

No problem, here is the entire function:

function esplanade_post_nav() {
	if( esplanade_get_option( 'post_nav' ) ) : ?>
		<div id="post-nav" class="navigation">
			<div class="nav-prev"><?php previous_post_link( '%link', '← %title', true ); ?></div>
			<div class="nav-next"><?php next_post_link( '%link', '%title →', true ); ?></div>
			<div class="clear"></div>
		</div><!-- #post-nav -->
	<?php endif;
}

Thank you, I was also looking for this!