commit abde725f0c71db1200f054effe54a718174cbfe0
Author: Joel Pittet <joel@pittet.ca>
Date:   Wed Dec 4 18:00:15 2013 -0800

    fix table sort indicated and remove image template

diff --git a/core/modules/system/templates/image.html.twig b/core/modules/system/templates/image.html.twig
deleted file mode 100644
index b6b238a..0000000
--- a/core/modules/system/templates/image.html.twig
+++ /dev/null
@@ -1,14 +0,0 @@
-{#
-/**
- * @file
- * Default theme implementation of an image.
- *
- * Available variables:
- * - attributes: HTML attributes for the img tag.
- *
- * @see template_preprocess_image()
- *
- * @ingroup themeable
- */
-#}
-<img{{ attributes }} />
diff --git a/core/themes/seven/seven.theme b/core/themes/seven/seven.theme
index ea523ad..c493254 100644
--- a/core/themes/seven/seven.theme
+++ b/core/themes/seven/seven.theme
@@ -120,8 +120,24 @@ function seven_preprocess_admin_block_content(&$variables) {
  * gray.
  */
 function seven_preprocess_tablesort_indicator(&$variables) {
-  $variables['uri'] = drupal_get_path('theme', 'seven') . '/images/arrow-' . ($variables['style'] == 'asc' ? 'asc' : 'desc') . '.png';
-  $variables['attributes']['src'] = file_create_url($variables['uri']);
+  $theme_path = drupal_get_path('theme', 'seven');
+  if ($variables['style'] == 'asc') {
+    $variables['uri'] = $theme_path . '/images/arrow-asc.png';
+    $text = t('Sort ascending');
+  }
+  else {
+    $variables['uri'] = $theme_path . '/images/arrow-desc.png';
+    $text = t('Sort descending');
+  }
+
+  $variables['image'] = array(
+    '#theme' => 'image',
+    '#uri' => $variables['uri'],
+    '#width' => 9,
+    '#height' => 5,
+    '#alt' => $text,
+    '#title' => $text,
+  );
 }
 
 /**