Phriction: define an object creation title

Test Plan:
* Create a new phriction document, observe the history
* Apply this patch
* Observe the history again, noting that the word "document" now replaces "object"

Reviewers: O1 Blessed Committers, avivey

Reviewed By: O1 Blessed Committers, avivey

Subscribers: tobiaswiese, valerio.bozzolan, Matthew, Cigaryno

Differential Revision: https://we.phorge.it/D25858

src/applications/phriction/editor/PhrictionTransactionEditor.php

@@ -108,6 +108,14 @@ final class PhrictionTransactionEditor
     return $types;
   }
 
+  public function getCreateObjectTitle($author, $object) {
+    return pht('%s created this document.', $author);
+  }
+
+  public function getCreateObjectTitleForFeed($author, $object) {
+    return pht('%s created %s.', $author, $object);
+  }
+
   protected function expandTransactions(
     PhabricatorLiskDAO $object,
     array $xactions) {