Slow down phase transitions

Slow down phase transitions and make it more clear to the user that one happened right now. Just after entering a valid phase, wait for ~ 5 seconds, show the current phase name at the center of the screen and after that show the currently existing voting or whatever we do have right now.

This makes it more clear what happened right now and slows down the game to a normal play speed.

This slow down is only a part of the UI and not of the core logic. Test cases are not affected by it. Votings will have the slow down added to its cooldown if necessary.