Extract HTML from themes.php

Signed-off-by: Maurício Meneghini Fauth <mauricio@fauth.dev>

templates/themes.twig

@@ -0,0 +1,7 @@
+<h1>phpMyAdmin - {% trans 'Theme' %}</h1>
+<p>
+  <a href="{{ 'https://www.phpmyadmin.net/themes/'|link }}#pma_{{ version }}" rel="noopener noreferrer" target="_blank">
+    {% trans 'Get more themes!' %}
+  </a>
+</p>
+{{ previews|raw }}

themes.php

@@ -7,34 +7,30 @@
  */
 declare(strict_types=1);
 
-use PhpMyAdmin\Core;
+use PhpMyAdmin\Template;
 use PhpMyAdmin\ThemeManager;
 use PhpMyAdmin\Response;
 
 if (! defined('ROOT_PATH')) {
     define('ROOT_PATH', __DIR__ . DIRECTORY_SEPARATOR);
 }
 
-/**
- * get some globals
- */
 include ROOT_PATH . 'libraries/common.inc.php';
 
+$template = new Template();
+
 $response = Response::getInstance();
 $response->getFooter()->setMinimal();
 $header = $response->getHeader();
 $header->setBodyId('bodythemes');
 $header->setTitle('phpMyAdmin - ' . __('Theme'));
 $header->disableMenuAndConsole();
 
-$hash    = '#pma_' . preg_replace('/([0-9]*)\.([0-9]*)\..*/', '\1_\2', PMA_VERSION);
-$url     = Core::linkURL('https://www.phpmyadmin.net/themes/') . $hash;
-$output  = '<h1>phpMyAdmin - ' . __('Theme') . '</h1>';
-$output .= '<p>';
-$output .= '<a href="' . $url . '" rel="noopener noreferrer" target="_blank">';
-$output .= __('Get more themes!');
-$output .= '</a>';
-$output .= '</p>';
-$output .= ThemeManager::getInstance()->getPrintPreviews();
-
-$response->addHTML($output);
+$response->addHTML($template->render('themes', [
+    'version' => preg_replace(
+        '/([0-9]*)\.([0-9]*)\..*/',
+        '\1_\2',
+        PMA_VERSION
+    ),
+    'previews' => ThemeManager::getInstance()->getPrintPreviews(),
+]));