Province / State drop-down on contribution form not translated

The drop-down for "State/Province" in the Billing address block that appears on a Contribution page is not being translated. I had translated the State names in the provinces.po file and recompiled the civicrm.mo file but they still weren't appearing. I tracked it down to no context being supplied to localizeArray() in stateProvinceForCountry() in CRM/Core/PseudoConstant.php

Patch attached for review.