Index: wp-admin/includes/meta-boxes.php
===================================================================
--- wp-admin/includes/meta-boxes.php	(revision 36846)
+++ wp-admin/includes/meta-boxes.php	(working copy)
@@ -569,7 +569,7 @@
 function post_excerpt_meta_box($post) {
 ?>
 <label class="screen-reader-text" for="excerpt"><?php _e('Excerpt') ?></label><textarea rows="1" cols="40" name="excerpt" id="excerpt"><?php echo $post->post_excerpt; // textarea_escaped ?></textarea>
-<p><?php _e('Excerpts are optional hand-crafted summaries of your content that can be used in your theme. <a href="https://codex.wordpress.org/Excerpt" target="_blank">Learn more about manual excerpts.</a>'); ?></p>
+<p><?php printf( __( 'Excerpts are optional hand-crafted summaries of your content that can be used in your theme. <a href="%s" target="_blank">Learn more about manual excerpts.</a>' ), __( 'https://codex.wordpress.org/Excerpt' ) ); ?></p>
 <?php
 }
 
@@ -598,7 +598,7 @@
 	<?php echo $form_trackback; ?>
 </p>
 <p id="trackback-url-desc" class="howto"><?php _e( 'Separate multiple URLs with spaces' ); ?></p>
-<p><?php _e('Trackbacks are a way to notify legacy blog systems that you&#8217;ve linked to them. If you link other WordPress sites, they&#8217;ll be notified automatically using <a href="https://codex.wordpress.org/Introduction_to_Blogging#Managing_Comments" target="_blank">pingbacks</a>, no other action necessary.'); ?></p>
+<p><?php printf( __( 'Trackbacks are a way to notify legacy blog systems that you&#8217;ve linked to them. If you link other WordPress sites, they&#8217;ll be notified automatically using <a href="%s" target="_blank">pingbacks</a>, no other action necessary.' ), __( 'https://codex.wordpress.org/Introduction_to_Blogging#Managing_Comments' ) ); ?></p>
 <?php
 if ( ! empty($pings) )
 	echo $pings;
@@ -624,7 +624,7 @@
 list_meta( $metadata );
 meta_form( $post ); ?>
 </div>
-<p><?php _e('Custom fields can be used to add extra metadata to a post that you can <a href="https://codex.wordpress.org/Using_Custom_Fields" target="_blank">use in your theme</a>.'); ?></p>
+<p><?php printf( __( 'Custom fields can be used to add extra metadata to a post that you can <a href="%s" target="_blank">use in your theme</a>.' ), __( 'https://codex.wordpress.org/Using_Custom_Fields' ) ); ?></p>
 <?php
 }