R1:2d5f3d9e5aff

Fix a pht string

Summary:
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…