Better issues pop-up

Problem to solve

At times the error messages are too vague, the goal would be to make them more precise while redesigning (if possible) the ui to improve the readability of the error. This will also allow to have more precise feedbacks.

Proposal

Try to do something like this:

TODO:

• Try to redraw the pop-up with a new ui
• Add error messages:
  • "server: connection lost"
  • "server: close"
  • "server: kick"
  • add more
• To think: Add Error code for doc

/cc @project-manager