This translation string is wrong and causes the following warning when running unit tests:
[2015-06-15 16:03:41] ERROR 2: vsprintf(): Too few arguments at [/home/joshua/workspace/github.com/phacility/libphutil/src/internationalization/PhutilTranslator.php:95] arcanist(head=master, ref.master=956bfa701c36), phabricator(head=master, ref.master=80f11427e576), phutil(head=master, ref.master=3ff84448a916) #0 vsprintf(string, array) called at [<phutil>/src/internationalization/PhutilTranslator.php:95] #1 PhutilTranslator::translate(string) #2 call_user_func_array(array, array) called at [<phutil>/src/internationalization/pht.php:17] #3 pht(string) called at [<phabricator>/src/applications/auth/controller/PhabricatorAuthStartController.php:75] #4 PhabricatorAuthStartController::handleRequest(AphrontRequest) called at [<phabricator>/src/aphront/AphrontController.php:69] #5 AphrontController::delegateToController(PhabricatorAuthStartController) called at [<phabricator>/src/applications/base/controller/PhabricatorController.php:213] #6 PhabricatorController::willBeginExecution() called at [<phabricator>/src/applications/base/controller/__tests__/PhabricatorAccessControlTestCase.php:270] #7 PhabricatorAccessControlTestCase::checkAccess(string, PhabricatorTestController, AphrontRequest, array, array) called at [<phabricator>/src/applications/base/controller/__tests__/PhabricatorAccessControlTestCase.php:112] #8 PhabricatorAccessControlTestCase::testControllerAccessControls() #9 call_user_func_array(array, array) called at [<arcanist>/src/unit/engine/phutil/PhutilTestCase.php:492] #10 PhutilTestCase::run() called at [<arcanist>/src/unit/engine/PhutilUnitTestEngine.php:65] #11 PhutilUnitTestEngine::run() called at [<arcanist>/src/workflow/ArcanistUnitWorkflow.php:186] #12 ArcanistUnitWorkflow::run() called at [<arcanist>/scripts/arcanist.php:382]