Add translator comments for strings in `theme-compat/footer.php`.

Props ramiy.
See #34503.

git-svn-id: https://develop.svn.wordpress.org/trunk@35456 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/theme-compat/footer.php

@@ -7,7 +7,14 @@
  * This file is here for Backwards compatibility with old themes and will be removed in a future version
  *
  */
-_deprecated_file( sprintf( __( 'Theme without %1$s' ), basename(__FILE__) ), '3.0', null, sprintf( __('Please include a %1$s template in your theme.'), basename(__FILE__) ) );
+_deprecated_file(
+	/* translators: %s: template name */
+	sprintf( __( 'Theme without %s' ), basename( __FILE__ ) ),
+	'3.0',
+	null,
+	/* translators: %s: template name */
+	sprintf( __( 'Please include a %s template in your theme.' ), basename( __FILE__ ) )
+);
 ?>
 
 <hr />