Tinygettext support for Windows

libintl from gettext is needed for a working snprintf() that supports positional parameters in the format string.

If using MSVC:
* Gettext binary: http://ftp.gnu.org/pub/gnu/gettext/gettext-runtime-0.13.1.bin.woe32.zip
* Define USE_TINYGETTEXT

The po files go in 7kaa/data/locale.