fix distcheck

Author: monsta

po/POTFILES.in

@@ -11,6 +11,7 @@ libmate-desktop/mate-colorsel.c
 libmate-desktop/mate-colorseldialog.c
 libmate-desktop/mate-desktop-item.c
 libmate-desktop/mate-desktop-utils.c
+libmate-desktop/mate-languages.c
 libmate-desktop/mate-rr.c
 libmate-desktop/mate-rr-config.c
 libmate-desktop/mate-rr-labeler.c