Correcting Core packs creation

Main ini file was missing from pack.
Some core files that were disabled in the list could not be added to the package.

This PR lets produce a minimum correct core package (when the localise.php is present in the xx-XX folder).
This is temporary until we refactor all aspects of package making. 
is not important but I think this could be:

```php
$site_txt .= '\t\t<filename>' . $data['language'] . '.' . $translation . '.ini</filename>\n';
```