#2 install.php fails when using constants

[Alvaro Gilabert]

(Syntax errors in lines 265 and 293 solved)

When executing install.php, it fails when using constants
and warns that the constants are undefined.

File: vars.php
Undefined constants:
title on line 9
title on line 12
welcome on line 13

File: admin_account.php
Undefined constants:
username on line 6
password on line 7
fname on line 8
lname on line 9
email on line 10

File: install.php
Undefined constant:
username on line 580