fix locale dirname, use system dirname like "/usr/share/locale"

tower: https://tower.im/projects/2e2ed7ac2b854b4b9d0bff47f60c4038/todos/e8692b44da074fd68f827f2fdcc80626/

Change-Id: I17b7848d791cc0af3ccfc13aa17f3e50973a64a6