Minor bugfixes in nav.php:

* Added videos to usermenu
* Fixed alt for personal notes
Exposes new profile data for templating.

* Boolean value of whether multi_profiles is enabled.
* Array needed for yesno_field for the hide-friends option.
Merge pull request #1037 from Beanow/feature/expose-profile-data

Exposes new profile data for templating.
Merge pull request #1035 from Beanow/hotfix/user-menu

Minor bugfixes in nav.php