I have realized today that we do not ship upstream's gettext translations in the Debian packages. Fixing this required a tiny little bit of thought. Upstream installs the catalogues as e.g. /usr/share/locale/pl/LC_MESSAGES/gnutls.mo. Shipping these files in libgnutls* would have broken co-installability of multiple versions of the library (libgnutls11 and libgnutls13).
Since the translations are tiny currently (about 80KB) I did not go for a libgnutls-data package but instead simply versioned the filename.
--- gnutls13-1.6.1/po/Makevars.orig 2006-03-03 16:16:16.000000000 +0000 +++ gnutls13-1.6.1/po/Makevars 2007-02-11 10:22:01.000000000 +0000 [...] # Usually the message domain is the same as the package name. -DOMAIN = $(PACKAGE) +DOMAIN = $(PACKAGE)13