Remove getApplicationObjectTypeName from ApplicationTransactions

Summary:
We can get this out of PHIDType reasonably in all cases and simplify implementation here.

None of these translate correctly anyway so they're basically debugging/development strings.

Test Plan: `grep`, browsed some transactions

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D6786

src/applications/macro/storage/PhabricatorMacroTransaction.php

@@ -19,10 +19,6 @@ final class PhabricatorMacroTransaction
     return new PhabricatorMacroTransactionComment();
   }
 
-  public function getApplicationObjectTypeName() {
-    return pht('macro');
-  }
-
   public function getRequiredHandlePHIDs() {
     $phids = parent::getRequiredHandlePHIDs();