Add colored dot to show connexion next to user name in Security & Acc

[CarolineDenis]

Fixes #3608

Checklist

• Self-review the PR after opening it to make sure the changes look good and
  self-explanatory (or properly documented)
• Add relevant issue to release milestone

Testing instructions

• Open security and account
• Verify there is a red or green dot next to each user under the user account section

TODO:

Set isLoggedIn to true upon login