Changes in settings page, refs #7722

- Make setting list-menu stick on scroll
- Split setting list in multiples pages
- Ghange settings menu path to 'settings/global' (migration/fixtures)
- Move Finding Aid format setting to Finding Aid settings page
- Change redirections to corresponding pages
- Few style changes
Can we stop using the template helper and do the following instead for consistency?

```
$i18n = sfContext::getInstance()->i18n;
echo $i18n->__('Title');
```