diff --git a/src/wp-content/themes/twentythirteen/404.php b/src/wp-content/themes/twentythirteen/404.php
index 528f82d372..cbd169a3cc 100644
--- a/src/wp-content/themes/twentythirteen/404.php
+++ b/src/wp-content/themes/twentythirteen/404.php
@@ -13,13 +13,13 @@ get_header(); ?>
 		<div id="content" class="site-content" role="main">
 
 			<header class="page-header">
-				<h1 class="page-title"><?php _e( 'Not Found', 'twentythirteen' ); ?></h1>
+				<h1 class="page-title"><?php esc_html_e( 'Not Found', 'twentythirteen' ); ?></h1>
 			</header>
 
 			<div class="page-wrapper">
 				<div class="page-content">
-					<h2><?php _e( 'This is somewhat embarrassing, isn&rsquo;t it?', 'twentythirteen' ); ?></h2>
-					<p><?php _e( 'It looks like nothing was found at this location. Maybe try a search?', 'twentythirteen' ); ?></p>
+					<h2><?php esc_html_e( 'This is somewhat embarrassing, isn&rsquo;t it?', 'twentythirteen' ); ?></h2>
+					<p><?php esc_html_e( 'It looks like nothing was found at this location. Maybe try a search?', 'twentythirteen' ); ?></p>
 
 					<?php get_search_form(); ?>
 				</div><!-- .page-content -->
diff --git a/src/wp-content/themes/twentythirteen/content-image.php b/src/wp-content/themes/twentythirteen/content-image.php
index 1052e670eb..c631788b5d 100644
--- a/src/wp-content/themes/twentythirteen/content-image.php
+++ b/src/wp-content/themes/twentythirteen/content-image.php
@@ -16,7 +16,7 @@
 		<h1 class="entry-title">
 			<a href="<?php the_permalink(); ?>" rel="bookmark"><?php the_title(); ?></a>
 		</h1>
-		<?php endif; // is_single() ?>
+		<?php endif; ?>
 	</header><!-- .entry-header -->
 
 	<div class="entry-content">
@@ -47,7 +47,7 @@
 		<span class="comments-link">
 			<?php comments_popup_link( '<span class="leave-reply">' . __( 'Leave a comment', 'twentythirteen' ) . '</span>', __( 'One comment so far', 'twentythirteen' ), __( 'View all % comments', 'twentythirteen' ) ); ?>
 		</span><!-- .comments-link -->
-		<?php endif; // comments_open() ?>
+		<?php endif; ?>
 		<?php edit_post_link( __( 'Edit', 'twentythirteen' ), '<span class="edit-link">', '</span>' ); ?>
 
 		<?php if ( is_single() && get_the_author_meta( 'description' ) && is_multi_author() ) : ?>
diff --git a/src/wp-content/themes/twentythirteen/content-none.php b/src/wp-content/themes/twentythirteen/content-none.php
index c82798ae84..37b3551b52 100644
--- a/src/wp-content/themes/twentythirteen/content-none.php
+++ b/src/wp-content/themes/twentythirteen/content-none.php
@@ -9,7 +9,7 @@
 ?>
 
 <header class="page-header">
-	<h1 class="page-title"><?php _e( 'Nothing Found', 'twentythirteen' ); ?></h1>
+	<h1 class="page-title"><?php esc_html_e( 'Nothing Found', 'twentythirteen' ); ?></h1>
 </header>
 
 <div class="page-content">
@@ -24,12 +24,12 @@
 
 	<?php elseif ( is_search() ) : ?>
 
-	<p><?php _e( 'Sorry, but nothing matched your search terms. Please try again with different keywords.', 'twentythirteen' ); ?></p>
+	<p><?php esc_html_e( 'Sorry, but nothing matched your search terms. Please try again with different keywords.', 'twentythirteen' ); ?></p>
 		<?php get_search_form(); ?>
 
 	<?php else : ?>
 
-	<p><?php _e( 'It seems we can&rsquo;t find what you&rsquo;re looking for. Perhaps searching can help.', 'twentythirteen' ); ?></p>
+	<p><?php esc_html_e( 'It seems we can&rsquo;t find what you&rsquo;re looking for. Perhaps searching can help.', 'twentythirteen' ); ?></p>
 		<?php get_search_form(); ?>
 
 	<?php endif; ?>
diff --git a/src/wp-content/themes/twentythirteen/functions.php b/src/wp-content/themes/twentythirteen/functions.php
index 8383b4cba3..cc8296beb8 100644
--- a/src/wp-content/themes/twentythirteen/functions.php
+++ b/src/wp-content/themes/twentythirteen/functions.php
@@ -480,7 +480,7 @@ if ( ! function_exists( 'twentythirteen_paging_nav' ) ) :
 		<h1 class="screen-reader-text">
 			<?php
 			/* translators: Hidden accessibility text. */
-			_e( 'Posts navigation', 'twentythirteen' );
+			esc_html_e( 'Posts navigation', 'twentythirteen' );
 			?>
 		</h1>
 		<div class="nav-links">
@@ -522,7 +522,7 @@ if ( ! function_exists( 'twentythirteen_post_nav' ) ) :
 		<h1 class="screen-reader-text">
 			<?php
 			/* translators: Hidden accessibility text. */
-			_e( 'Post navigation', 'twentythirteen' );
+			esc_html_e( 'Post navigation', 'twentythirteen' );
 			?>
 		</h1>
 		<div class="nav-links">
diff --git a/src/wp-content/themes/twentythirteen/header.php b/src/wp-content/themes/twentythirteen/header.php
index 7d94060f6b..314bbb36d3 100644
--- a/src/wp-content/themes/twentythirteen/header.php
+++ b/src/wp-content/themes/twentythirteen/header.php
@@ -41,11 +41,11 @@
 
 			<div id="navbar" class="navbar">
 				<nav id="site-navigation" class="navigation main-navigation">
-					<button class="menu-toggle"><?php _e( 'Menu', 'twentythirteen' ); ?></button>
+					<button class="menu-toggle"><?php esc_html_e( 'Menu', 'twentythirteen' ); ?></button>
 					<a class="screen-reader-text skip-link" href="#content">
 						<?php
 						/* translators: Hidden accessibility text. */
-						_e( 'Skip to content', 'twentythirteen' );
+						esc_html_e( 'Skip to content', 'twentythirteen' );
 						?>
 					</a>
 					<?php