Show snippet of vote description in vote summary

Summary: This is editable now.

Test Plan: {F50208}

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D6462

src/applications/slowvote/controller/PhabricatorSlowvoteListController.php

@@ -53,6 +53,11 @@ final class PhabricatorSlowvoteListController
         ->setHref('/V'.$poll->getID())
         ->addIcon('none', $date_created);
 
+      $description = $poll->getDescription();
+      if (strlen($description)) {
+        $item->addAttribute(phutil_utf8_shorten($poll->getDescription(), 120));
+      }
+
       if ($author) {
         $item->addByline(pht('Author: %s', $author));
       }