Index: feed-atom-comments.php
===================================================================
--- feed-atom-comments.php	(revision 11518)
+++ feed-atom-comments.php	(working copy)
@@ -16,10 +16,13 @@
 >
 	<title type="text"><?php
 		if ( is_singular() )
+      /* translators: do not use HTML entities (&nbsp;, etc.): string is used in XML feeds */
 			printf(ent2ncr(__('Comments on: %s')), get_the_title_rss());
 		elseif ( is_search() )
+      /* translators: do not use HTML entities (&nbsp;, etc.): string is used in XML feeds */
 			printf(ent2ncr(__('Comments for %1$s searching on %2$s')), get_bloginfo_rss( 'name' ), esc_attr(get_search_query()));
 		else
+      /* translators: do not use HTML entities (&nbsp;, etc.): string is used in XML feeds */
 			printf(ent2ncr(__('Comments for %s')), get_bloginfo_rss( 'name' ) . get_wp_title_rss());
 	?></title>
 	<subtitle type="text"><?php bloginfo_rss('description'); ?></subtitle>
@@ -51,8 +54,10 @@
 			if ( !is_singular() ) {
 				$title = get_the_title($comment_post->ID);
 				$title = apply_filters('the_title_rss', $title);
+        /* translators: do not use HTML entities (&nbsp;, etc.): string is used in XML feeds */
 				printf(ent2ncr(__('Comment on %1$s by %2$s')), $title, get_comment_author_rss());
 			} else {
+        /* translators: do not use HTML entities (&nbsp;, etc.): string is used in XML feeds */
 				printf(ent2ncr(__('By: %s')), get_comment_author_rss());
 			}
 		?></title>
Index: feed-rss2-comments.php
===================================================================
--- feed-rss2-comments.php	(revision 11518)
+++ feed-rss2-comments.php	(working copy)
@@ -19,10 +19,13 @@
 <channel>
 	<title><?php
 		if ( is_singular() )
+      /* translators: do not use HTML entities (&nbsp;, etc.): string is used in XML feeds */
 			printf(ent2ncr(__('Comments on: %s')), get_the_title_rss());
 		elseif ( is_search() )
+      /* translators: do not use HTML entities (&nbsp;, etc.): string is used in XML feeds */
 			printf(ent2ncr(__('Comments for %s searching on %s')), get_bloginfo_rss( 'name' ), esc_attr($wp_query->query_vars['s']));
 		else
+      /* translators: do not use HTML entities (&nbsp;, etc.): string is used in XML feeds */
 			printf(ent2ncr(__('Comments for %s')), get_bloginfo_rss( 'name' ) . get_wp_title_rss());
 	?></title>
 	<atom:link href="<?php self_link(); ?>" rel="self" type="application/rss+xml" />
@@ -43,8 +46,10 @@
 			if ( !is_singular() ) {
 				$title = get_the_title($comment_post->ID);
 				$title = apply_filters('the_title_rss', $title);
+        /* translators: do not use HTML entities (&nbsp;, etc.): string is used in XML feeds */
 				printf(ent2ncr(__('Comment on %1$s by %2$s')), $title, get_comment_author_rss());
 			} else {
+        /* translators: do not use HTML entities (&nbsp;, etc.): string is used in XML feeds */
 				printf(ent2ncr(__('By: %s')), get_comment_author_rss());
 			}
 		?></title>
@@ -53,6 +58,7 @@
 		<pubDate><?php echo mysql2date('D, d M Y H:i:s +0000', get_comment_time('Y-m-d H:i:s', true, false), false); ?></pubDate>
 		<guid isPermaLink="false"><?php comment_guid() ?></guid>
 <?php if ( post_password_required($comment_post) ) : ?>
+    /* translators: do not use HTML entities (&nbsp;, etc.): string is used in XML feeds */
 		<description><?php echo ent2ncr(__('Protected Comments: Please enter your password to view comments.')); ?></description>
 		<content:encoded><![CDATA[<?php echo get_the_password_form() ?>]]></content:encoded>
 <?php else : // post pass ?>