Adding changes from d24b66f56c

From @Thomas-A-Reinert

css/theme.css

@@ -5024,6 +5024,16 @@ a.skip-link {
   margin-right: .425rem;
   margin-left: .425rem; }
 
+.post-navigation {
+  padding-top: 1rem;
+  margin-top: 1rem;
+  border-top: 1px solid #373a3c; }
+
+.nav-previous a,
+.nav-next a {
+  text-decoration: none;
+  color: #373a3c; }
+
 .dropdown-menu .dropdown-menu {
   position: relative;
   display: block;

inc/template-tags.php

@@ -7,6 +7,7 @@
  * @package understrap
  */
 
+
 if ( ! function_exists( 'understrap_posted_on' ) ) :
 /**
  * Prints HTML with meta information for the current post-date/time and author.
@@ -14,8 +15,7 @@ if ( ! function_exists( 'understrap_posted_on' ) ) :
 function understrap_posted_on() {
 	$time_string = '<time class="entry-date published updated" datetime="%1$s">%2$s</time>';
 	if ( get_the_time( 'U' ) !== get_the_modified_time( 'U' ) ) {
-			$time_string = '<time class="entry-date published" datetime="%1$s">%2$s</time>, <time class="updated" datetime="%3$s">' . __( ' Edited %4$s',
+		$time_string = '<time class="entry-date published" datetime="%1$s">%2$s</time>, <time class="updated" datetime="%3$s">' . __( ' Edited %4$s', 'understrap' ) . '</time>';
-			'understrap' ) . '</time>';
 	}
 
 	$time_string = sprintf( $time_string,
@@ -50,8 +50,7 @@ if ( ! function_exists( 'understrap_entry_footer' ) ) :
 		/* translators: used between list items, there is a space after the comma */
 		$categories_list = get_the_category_list( __( ', ', 'understrap' ) );
 		if ( $categories_list && understrap_categorized_blog() ) {
-				printf( '<span class="cat-links">' . __( 'Posted in %1$s', 'understrap' ) . '</span>',
+			printf( '<span class="cat-links">' . __( 'Posted in %1$s', 'understrap' ) . '</span>', $categories_list );
-				$categories_list );
 		}
 
 		/* translators: used between list items, there is a space after the comma */
@@ -63,8 +62,7 @@ if ( ! function_exists( 'understrap_entry_footer' ) ) :
 
 	if ( ! is_single() && ! post_password_required() && ( comments_open() || get_comments_number() ) ) {
 		echo '<span class="comments-link">';
-			comments_popup_link( __( 'Leave a comment', 'understrap' ), __( '1 Comment', 'understrap' ),
+		comments_popup_link( __( 'Leave a comment', 'understrap' ), __( '1 Comment', 'understrap' ), __( '% Comments', 'understrap' ) );
-			__( '% Comments', 'understrap' ) );
 		echo '</span>';
 	}
 
@@ -121,6 +119,38 @@ function understrap_category_transient_flusher() {
 	// Like, beat it. Dig?
 	delete_transient( 'understrap_categories' );
 }
-
 add_action( 'edit_category', 'understrap_category_transient_flusher' );
 add_action( 'save_post',     'understrap_category_transient_flusher' );
+
+
+/**
+ * Display navigation to next/previous post when applicable.
+ */
+if ( ! function_exists( 'understrap_post_nav' ) ) :
+
+	function understrap_post_nav() {
+		// Don't print empty markup if there's nowhere to navigate.
+		$previous = ( is_attachment() ) ? get_post( get_post()->post_parent ) : get_adjacent_post( false, '', true );
+		$next     = get_adjacent_post( false, '', false );
+
+		if ( ! $next && ! $previous ) {
+			return;
+		}
+		?>
+		<nav class="navigation post-navigation">
+			<h1 class="sr-only"><?php _e( 'Post navigation', 'understrap' ); ?></h1>
+			<div class="nav-links">
+				<?php
+
+					if ( get_previous_post_link() ) {
+						previous_post_link( '<span class="nav-previous float-xs-left btn btn-sm btn-secondary">%link</span>', _x( '<span class="fa fa-backward"></span>&nbsp;%title', 'Previous post link', 'understrap' ) );
+					}
+					if ( get_next_post_link() ) {
+						next_post_link( '<span class="nav-next float-xs-right btn btn-sm btn-secondary">%link</span>',     _x( '%title&nbsp;<span class="fa fa-forward"></span>', 'Next post link', 'understrap' ) );
+					}
+				?>
+			</div><!-- .nav-links -->
+		</nav><!-- .navigation -->
+		<?php
+	}
+endif;

sass/understrap/understrap.scss

@@ -130,6 +130,18 @@ a.skip-link {
   margin-left: .425rem;
 }
 
+.post-navigation {
+  padding-top: 1rem;
+  margin-top: 1rem;
+  border-top: 1px solid $gray-dark;
+}
+
+.nav-previous a,
+.nav-next a {
+  text-decoration: none;
+  color: $gray-dark;
+}
+
 // Fixing BS dropdown in a dropdown
 .dropdown-menu .dropdown-menu {
   position: relative;