Save the draft translations automatically

* Removed the "Save as draft" button. Only publish button exist now
* Save the drafts in progress calculation change with extra throttling
* Autosave in every 5 minutes timeout too
* Control+S will also save the translations. This action is an
  immediate action and not throttled.
* ext.cx.draft module is loaded only when the CX database is configured.

Bug: T76182
Change-Id: I9173128b80928040caea6f810be1e6094db1c815
Merge "Save the draft translations automatically"