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a string, should we ask them to locate that string in *all* translations and
remove them, to make it clear the translation is no longer used?  I doubt we
would want the translation files to end up with the complete set of strings
ever used now or in the past with no indication if the string is actually
used in the current version.  Or is there another alternative that can help
us keep these things in synch over time and detect old, unused translations
for each locale?

Thanks,

Mark