change last known position label on nomad trips

[newick]

currently it's "latest location" but you have no clue of the time when the nomad was there

[vinyll]

We could have something like "was here 2 days ago", "was here today" for example. Any suggestion?

[amberfrancis]

Or users can 'check in' to a location and select the number of days they plan to stay...i.e. User is in Barcelona on a three day trip, last seen two days ago