Fix some issues with Phabricator i18n string extraction

Summary: Ref T5267. Fix one minor bug (paths were not being resolved properly) and one minor string issue (missing %d in a string).

Test Plan: Extracted strings, got a cleaner result.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T5267

Differential Revision: https://secure.phabricator.com/D16808