Fix some copy and bugs in Ponder

Summary: Fixes T12939. Fixes some feed stories, mailtags, and headers.

Test Plan: Review changes locally by asking how babby is formed.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T12939

Differential Revision: https://secure.phabricator.com/D18285

src/applications/ponder/controller/PonderQuestionViewController.php

···
       $wiki = new PHUIRemarkupView($viewer, $question->getAnswerWiki());
       $answer_wiki = id(new PHUIObjectBoxView())
         ->setBackground(PHUIObjectBoxView::BLUE_PROPERTY)
-        ->setHeaderText(pht('ANSWER SUMMARY'))
+        ->setHeaderText(pht('Answer Summary'))
         ->appendChild($wiki)
         ->addClass('ponder-answer-wiki');
     }

src/applications/ponder/editor/PonderQuestionEditor.php

···
   }
 
   public function getCreateObjectTitle($author, $object) {
-    return pht('%s created this question.', $author);
+    return pht('%s asked this question.', $author);
   }
 
   public function getCreateObjectTitleForFeed($author, $object) {
-    return pht('%s created %s.', $author, $object);
+    return pht('%s asked %s.', $author, $object);
   }
 
   /**

src/applications/ponder/storage/PonderAnswerTransaction.php

···
     return 'PonderAnswerTransactionType';
   }
 
+  public function getMailTags() {
+    $tags = parent::getMailTags();
+    $tags[] = PonderQuestionTransaction::MAILTAG_OTHER;
+
+    return $tags;
+  }
+
 }

src/applications/ponder/xaction/PonderAnswerContentTransaction.php

···
   }
 
   public function getTitle() {
+    $old = $this->getOldValue();
+
+    if (!strlen($old)) {
+      return pht(
+        '%s added an answer.',
+        $this->renderAuthor());
+    }
+
     return pht(
       '%s updated the answer details.',
       $this->renderAuthor());
   }
 
   public function getTitleForFeed() {
+    $old = $this->getOldValue();
+
+    if (!strlen($old)) {
+      return pht(
+        '%s added %s.',
+        $this->renderAuthor(),
+        $this->renderObject());
+    }
+
     return pht(
       '%s updated the answer details for %s.',
       $this->renderAuthor(),