Upgrade to Moodle 2.4.8

- Revision of count of downloads
- Revision of upload of PDI materials
- Revision of backup generation
- Revision of Terms of use Styling
- Pending to approve records now are grayed out
- Reporting pages now have blocks
- Added sorting default options of databases
- More useful error information
- Backup and restore improvements
- Autodetecting of moodle version of course records.
- Translation
- Now if one record remains without file or course target for 24h and it is visited, it becomes pending to approve