[translations] autolocale automatic installation

[Jakub Suchy]

Gabor,
very nice work, thanks!

I found two little bugs, created patches and issued them:

1) When displaying module page for the first time, there is no
$_SESSION['autolocale_modules'] yet.

http://drupal.org/node/115579

2) Due to one security bug in PHP two years ago, glob() is disabled on
many shared hosts. Therefore i suggest to use opendir(), search for
files and save them to $files array.

I have also added one more is_readable() check to the code and added
drupal_set_message(t('Imported translation file ' . basename($filepath)), 'status');
(Because user need to know something happened to his translations.

http://drupal.org/node/115581

Jakub