Translations output to stderr

[NightStrike]

When I compile gcc without "--disable-nls", I see lines such as the
following outputted to stderr:

0 translated messages, 170 fuzzy translations, 23 untranslated messages.
193 translated messages.

I understand why lines of the first type are output to stderr, as it
represents an imperfect translation.  However, why is the second line
not sent to stdout instead?  If there is no issue with the
translation, if everything went fine, shouldn't that go to stdout
instead of stderr?