[ui] More meaningful names for tabs on main page

http://beatweb-staging/events/smarcel/

Events -> Activity ? this could be a place to put also later on a Leaderboard

System Objects -> Resources (Data and Computing)

For the others what about sticky to the Open Science terminology ( https://en.wikipedia.org/wiki/Open_science ) ?

Objects -> Open Source -- it might not be 100% correct if we accommodate binaries are some point ! Queries -> Open Access

Note that the Teams can me moved from Objects to Queries as it is a sharing feature.

My 2 cents