Themes: Add feedback for screen readers when search results are changed.

props obenland, joedolson.
see #26600.

git-svn-id: https://develop.svn.wordpress.org/trunk@31497 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/themes.php

@@ -198,7 +198,7 @@ if ( ! $ct->errors() || ( 1 == count( $ct->errors()->get_error_codes() )
 
 ?>
 
-<div class="theme-browser">
+<div class="theme-browser" aria-live="polite">
 	<div class="themes">
 
 <?php
@@ -250,11 +250,10 @@ foreach ( $themes as $theme ) :
 <?php endforeach; ?>
 	<br class="clear" />
 	</div>
+	<p class="no-themes"><?php _e( 'No themes found. Try a different search.' ); ?></p>
 </div>
 <div class="theme-overlay"></div>
 
-<p class="no-themes"><?php _e( 'No themes found. Try a different search.' ); ?></p>
-
 <?php
 // List broken themes, if any.
 if ( ! is_multisite() && current_user_can('edit_themes') && $broken_themes = wp_get_themes( array( 'errors' => true ) ) ) {