configure.ac.in: fix missing XDT_I18N call

Open Enrico Weigelt requested to merge metux/xfdesktop:submit/fix_234_msgfmt into master

glib's gettext machinery wasn't set up correctly, on make run getting the error:

/usr/bin/msgfmt: error while opening "@MSGFMT_OPTS@" for reading: No such file or directory

Closes: #234 (closed) Signed-off-by: Enrico Weigelt, metux IT consult info@metux.net

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