Destructive actions should ask for confirmation

[kanytu]

Context: Destructive actions like delete, remove etc should always ask for confirmation to prevent accidental behaviors. Since the remove account is not hinted anywhere in the application, the user has no information on what will happen if he long presses an account (which is commonly associated with "More actions"). In the mist of this situation, I've added:

• Added dialog on long press action
• Added a small tooltip at the bottom of the navigation bar informing the user about this action

[Neamar]

Thanks! The UX was improvable indeed ;)