A movable alert in the middle of the screen for the strongest active
effect from C_LossOfControl: icon, cooldown sweep, the effect's name and
the seconds left. A school lockout reads "<School> Locked". It opens on
LOSS_OF_CONTROL_ADDED / _UPDATE and rescans every 0.1s while shown,
because a refreshed debuff or a second kick changes the timer without an
event.
The labels are Classic Era's LOSS_OF_CONTROL_DISPLAY_* GlobalStrings,
added to each locale file. The README lists the alert and the dressing
room controls.