little fix for setup.php to save during installation chosen language

[ccagle8]

This was broken quite a while back when NY rewrote the functions.php/common.php code.

http://code.google.com/p/get-simple-cms/...php&old=36

I've added that code back in.

Thank you so much for all your hard work over the last week or so finding these bugs. i really appreciate it!