Reduce calls to location on user management details page

[smessie]

When going to a user on the user management details page, for every location reservation, a call to the locations/{id} is made, this can't be the way to do
either

• include the location information in the original 'get location reservations' response
• or, cache the location information so that for the each location, the call is only done once, e.g. map with locationId as key