Identify entities by DB PKs instead of per-project IDs
Identify entities by DB PKs instead of per-project IDs

Fixes issue caused by Ajaxian Go button, that prevented Machinery
and Locales tabs from updating when new project was loaded.

participedia/pontoon,sudheesh001/pontoon,jotes/pontoon,mastizada/pontoon,mozilla/pontoon,mathjazz/pontoon,mozilla/pontoon,sudheesh001/pontoon,mozilla/pontoon,mathjazz/pontoon,mastizada/pontoon,sudheesh001/pontoon,mathjazz/pontoon,participedia/pontoon,participedia/pontoon,jotes/pontoon,jotes/pontoon,mozilla/pontoon,mastizada/pontoon,mastizada/pontoon,mathjazz/pontoon,mozilla/pontoon,participedia/pontoon,mathjazz/pontoon,jotes/pontoon,sudheesh001/pontoon