#221 Make it more clear whether a user just subscribes to a ticket or a complete tracker a month ago

Ticket created by ~miterion on ~sircmpwn/todo.sr.ht

Currently if a user switches between the ticket overview and a singular ticket the "Enable notification" button stays at the same position and looks almost the same (except it is now called "enable notification"). It might not be clear for a user that it has now a different function (subscribing to the notifications of a single ticket instead of the whole tracker).