2180: fork translations when their source is deleted
2180: fork translations when their source is deleted

Only happens when you delete *all* versions of the source.  We may need to
revisit that in the future, but hopefully this is goo enough until we tear out
the forking stuff anyway.

ujdhesa/unisubs,pculture/unisubs,ujdhesa/unisubs,pculture/unisubs,ofer43211/unisubs,eloquence/unisubs,eloquence/unisubs,wevoice/wesub,wevoice/wesub,eloquence/unisubs,wevoice/wesub,pculture/unisubs,ofer43211/unisubs,ReachingOut/unisubs,ujdhesa/unisubs,norayr/unisubs,ofer43211/unisubs,norayr/unisubs,ReachingOut/unisubs,ReachingOut/unisubs,norayr/unisubs,pculture/unisubs,ReachingOut/unisubs,eloquence/unisubs,norayr/unisubs,wevoice/wesub,ofer43211/unisubs,ujdhesa/unisubs