Some localization notes.
Added support in the Uize.Data.Diff module for a skeleton option - this option allows one to optionally get at a minimum a skeleton object as the comparison result, representing the union of the structures of the two objects being compared. Updated the LocAdapter base class to use the new skeleton option so that empty resource string groups are retained through the export and pseudo-localization process, rather than being lost - this is important for some code that may expect that structure in the resource string files, even if there is no contents.
More localization notes.