Hitchwiki:Promote picking up hitchhikers

Let's promote picking up hitchhikers.

• improve http://hitchwiki.org/en/Picking_up_hitchhikers
• translate http://hitchwiki.org/en/Picking_up_hitchhikers into Spanish, Italian, Swedish, Norwegian, Greek (add more languages of countries where people don't stop)

• Get a Hitchwiki Google Grants account.