Ref T5267. When the cache format changes (as it did when I added types recently) make it easier to get a clean rebuild.
- Maniphest Tasks
- T5267: Localize Phabricator
- rTRANSLATEWIKI1433d08de8f6: Add a "--clean" flag to "bin/translatewiki export" to drop project caches
Ran bin/translatewiki export --clean, got clean exports.