R1:199300565142

Fix a variant translation issue

Summary: Fixes T11799. This string is varying on the first parameter, but should vary on the second parameter.

Test Plan: Ran `bin/garbage set-policy ...`, saw proper translation.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T11799

Differential Revision: https://secure.phabricator.com/D16769