Friends: only match first and last name

The login and email should not be matchable as it leaks too much information
about the user base.
Friends: do not match self while searching for friends
Friends: assert that the query length is at least 3 chars
Profile: reduce SQL requests count
Friends: remove some SQL requests
Outings: use select_related when necessary
Profile: add modal for friend request accept/refuse/cancel
Alert: use a seperate template file
Update french translation
Register: use a seperated template file