1. Add check for invalid characters in menu_class plugin.

2. Optimization for help language list process

Plugson/pack.sh

@@ -17,6 +17,10 @@ if [ -f ./www.tar.xz ]; then
     rm -f ./www.tar.xz
 fi
 
+[ -f ./www/helplist ] && rm -f ./www/helplist
+ls -1 ../INSTALL/grub/help/ | while read line; do 
+    echo -n ${line:0:5} >> ./www/helplist
+done 
 echo -n "$plugson_verion" > ./www/buildtime
 
 tar cf www.tar www