Tray icons should use proper tooltips instead of the :title: attribute

[rafaellehmkuhl]

The :title: attribute takes too much time to open, so most users won't see if even if they decide to hover the icons to see what they mean.

The ideal is to use proper tooltips, like popper.js.

[github-actions]

Yo, this issue might be related to:

• Not all top bar icons have tooltips #3613: same concern about missing/inadequate tooltips on top bar icons