Index: src/wp-admin/theme-editor.php
===================================================================
--- src/wp-admin/theme-editor.php	(revision 25025)
+++ src/wp-admin/theme-editor.php	(working copy)
@@ -30,7 +30,7 @@
 	<p id="newcontent-description">' . __('In the editing area the Tab key enters a tab character. To move below this area by pressing Tab, press the Esc key followed by the Tab key.') . '</p>
 	<p>' . __('After typing in your edits, click Update File.') . '</p>
 	<p>' . __('<strong>Advice:</strong> think very carefully about your site crashing if you are live-editing the theme currently in use.') . '</p>
-	<p>' . __('Upgrading to a newer version of the same theme will override changes made here. To avoid this, consider creating a <a href="http://codex.wordpress.org/Child_Themes" target="_blank">child theme</a> instead.') . '</p>' .
+	<p>' . sprintf( __( 'Upgrading to a newer version of the same theme will override changes made here. To avoid this, consider creating a <a href="%s" target="_blank">child theme</a> instead.', __( 'http://codex.wordpress.org/Child_Themes' ) ) . '</p>' .
 	( is_network_admin() ? '<p>' . __('Any edits to files from this screen will be reflected on all sites in the network.') . '</p>' : '' )
 ) );
 
Index: src/wp-admin/update-core.php
===================================================================
--- src/wp-admin/update-core.php	(revision 25025)
+++ src/wp-admin/update-core.php	(working copy)
@@ -265,7 +265,7 @@
 ?>
 <h3><?php _e( 'Themes' ); ?></h3>
 <p><?php _e( 'The following themes have new versions available. Check the ones you want to update and then click &#8220;Update Themes&#8221;.' ); ?></p>
-<p><?php printf( __('<strong>Please Note:</strong> Any customizations you have made to theme files will be lost. Please consider using <a href="%s">child themes</a> for modifications.'), _x('http://codex.wordpress.org/Child_Themes', 'Link used in suggestion to use child themes in GUU') ); ?></p>
+<p><?php printf( __( '<strong>Please Note:</strong> Any customizations you have made to theme files will be lost. Please consider using <a href="%s">child themes</a> for modifications.'), __( 'http://codex.wordpress.org/Child_Themes' ) ); ?></p>
 <form method="post" action="<?php echo esc_url( $form_action ); ?>" name="upgrade-themes" class="upgrade">
 <?php wp_nonce_field('upgrade-core'); ?>
 <p><input id="upgrade-themes" class="button" type="submit" value="<?php esc_attr_e('Update Themes'); ?>" name="upgrade" /></p>