I have setup tikiwiki-1.9.7, MySQL 5.0.45 Apache 2.2.4. The Language in Admin-> General is setup to 'English (en)'. So far so good.
Nevertheless, when I attempted to change the login box's label 'user' to 'screen name', and 'pass' to 'password', I could make it happen by editing templates/modules/mod-login_box.tpl. I soon realized that this is not a good place to do it. So, after reading the tiki online doc, I decided to modify lang/en/language.php instead.
I commented out 'user' => 'user', and changed it to 'user' => 'screen name',
'pass' => 'pass', and changed it to 'pass' => 'password'.
Then, Admin -> System Admin -> Template compiler -> en -> Compile.
But, the above didn't change the two labels to what I wanted. I didn't get any errors either.
Am I missing anything? Any hints/tips are appreciated.