Revert "Use latin script languages whitelist"

Summary:
This reverts commit 18e85899475edfce4fcbd3bab1fc3eaed4335440.

Path should be absolute

Test Plan:
Tested on Daeghrefn

23:18:01 <Daeghrefn> IOError: [Errno 2] No such file or directory: 'l10n/latin-whitelist.json'

Reviewers: dereckson

Subscribers: Ash-Crow

Differential Revision: https://devcentral.nasqueron.org/D524