This is the GNU gettext package. It is interesting for authors or maintainers of other packages or programs which they want to see internationalized. As one step the handling of messages in different languages should be implemented. For this task GNU gettext provides the needed tools and library functions.
Internationalization on Win32 systems might push other porting projects forward. Anyway, since this package has already been ported it is nothing really brand new. But now you'll find it at some central point.