I18n: ensure all text strings with placeholders have translators comments.

footer.php

@@ -15,9 +15,15 @@
 
 	<footer id="colophon" class="site-footer" role="contentinfo">
 		<div class="site-info">
-			<a href="<?php echo esc_url( __( 'https://wordpress.org/', '_s' ) ); ?>"><?php printf( esc_html__( 'Proudly powered by %s', '_s' ), 'WordPress' ); ?></a>
+			<a href="<?php echo esc_url( __( 'https://wordpress.org/', '_s' ) ); ?>"><?php
+				/* translators: %s: CMS name, i.e. WordPress. */
+				printf( esc_html__( 'Proudly powered by %s', '_s' ), 'WordPress' );
+			?></a>
 			<span class="sep"> | </span>
-			<?php printf( esc_html__( 'Theme: %1$s by %2$s.', '_s' ), '_s', '<a href="https://automattic.com/" rel="designer">Automattic</a>' ); ?>
+			<?php
+				/* translators: 1: Theme name, 2: Theme author. */
+				printf( esc_html__( 'Theme: %1$s by %2$s.', '_s' ), '_s', '<a href="https://automattic.com/" rel="designer">Automattic</a>' );
+			?>
 		</div><!-- .site-info -->
 	</footer><!-- #colophon -->
 </div><!-- #page -->

inc/template-tags.php

@@ -25,11 +25,13 @@ function _s_posted_on() {
 	);
 
 	$posted_on = sprintf(
+		/* translators: %s: post date. */
 		esc_html_x( 'Posted on %s', 'post date', '_s' ),
 		'<a href="' . esc_url( get_permalink() ) . '" rel="bookmark">' . $time_string . '</a>'
 	);
 
 	$byline = sprintf(
+		/* translators: %s: post author. */
 		esc_html_x( 'by %s', 'post author', '_s' ),
 		'<span class="author vcard"><a class="url fn n" href="' . esc_url( get_author_posts_url( get_the_author_meta( 'ID' ) ) ) . '">' . esc_html( get_the_author() ) . '</a></span>'
 	);
@@ -49,12 +51,14 @@ function _s_entry_footer() {
 		/* translators: used between list items, there is a space after the comma */
 		$categories_list = get_the_category_list( esc_html__( ', ', '_s' ) );
 		if ( $categories_list && _s_categorized_blog() ) {
+			/* translators: 1: list of categories. */
 			printf( '<span class="cat-links">' . esc_html__( 'Posted in %1$s', '_s' ) . '</span>', $categories_list ); // WPCS: XSS OK.
 		}
 
 		/* translators: used between list items, there is a space after the comma */
 		$tags_list = get_the_tag_list( '', esc_html__( ', ', '_s' ) );
 		if ( $tags_list ) {
+			/* translators: 1: list of tags. */
 			printf( '<span class="tags-links">' . esc_html__( 'Tagged %1$s', '_s' ) . '</span>', $tags_list ); // WPCS: XSS OK.
 		}
 	}

search.php

@@ -16,7 +16,10 @@ get_header(); ?>
 		if ( have_posts() ) : ?>
 
 			<header class="page-header">
-				<h1 class="page-title"><?php printf( esc_html__( 'Search Results for: %s', '_s' ), '<span>' . get_search_query() . '</span>' ); ?></h1>
+				<h1 class="page-title"><?php
+					/* translators: %s: search query. */
+					printf( esc_html__( 'Search Results for: %s', '_s' ), '<span>' . get_search_query() . '</span>' );
+				?></h1>
 			</header><!-- .page-header -->
 
 			<?php

template-parts/content-none.php

@@ -18,7 +18,10 @@
 		<?php
 		if ( is_home() && current_user_can( 'publish_posts' ) ) : ?>
 
-			<p><?php printf( wp_kses( __( 'Ready to publish your first post? <a href="%1$s">Get started here</a>.', '_s' ), array( 'a' => array( 'href' => array() ) ) ), esc_url( admin_url( 'post-new.php' ) ) ); ?></p>
+			<p><?php
+				/* translators: 1: link to WP admin new post page. */
+				printf( wp_kses( __( 'Ready to publish your first post? <a href="%1$s">Get started here</a>.', '_s' ), array( 'a' => array( 'href' => array() ) ) ), esc_url( admin_url( 'post-new.php' ) ) );
+			?></p>
 
 		<?php elseif ( is_search() ) : ?>