Some updates

Made a few minor updates. When running /install.php, my server reported some PHP errors complaining about not being able to chmod() some directories.

It was right; I had put them in using Git on Samba (because I'm lazy and it's my dev box) so PHP indeed had no permission. Fixed that on my server and added some detection code.

Also removed all double quotes. I think we should stick to that. Furthermore, I changed the language a bit.

I'm too tired to even be able to code anymore, so I wish you all a good night.