I have successfully made a custom template. I figured I did my over-rides correctly, but I can't change the stupid 'Welcome to...' or the 'Welcome guest'.

1. I've tried to change the index.php in includes/languages/my_template but nothing happens.
2. I've also changed the index.php in the includes/languages/english and nothing happens
3. I've tried changing the index.php in the includes/languages/english/my_template

Am I supposed to have the index in all of these places? Sounds really silly. If so why do none of them change?