It would be nice if the Translation check was
equipped with a property to ignore missing keys in
overriding (non-default) resource files.
This would reflect the case when all keys have not
(yet) been translated, and fallback to the default
value is desired (without having to duplicate the
default value in all language files).
Such an ignore property would leave only the feature
to find properties defined in overriding files but
not in the default file, but that would be good
enough for many projects.