Disable sync information in agent table by default

[gdiazlo]

Describe the solution you'd like

The agent sync information is not relevant for everybody and we want it hidden in a default install. Furthermore, we want to delete the global sync indicator in the upper widget.

We want to change the texts:
IP -> IP address
OS -> Operating system

We need to ensure most common operating systems have their icons in the list.

Lastly, we want to re-distribute the space for each column, trying to avoid truncation.

Related issue #3402