debian/apt.cron.daily: export LANGUAGE LC_MESSAGES LC_ALL as well

debian/apt.cron.daily

@@ -434,7 +434,7 @@ random_sleep
 # fetch the right translated package descriptions
 if [ -r /etc/default/locale ]; then
     . /etc/default/locale
-    export LANG
+    export LANG LANGUAGE LC_MESSAGES LC_ALL
 fi
 
 # update package lists