feat(todolist): Push To Top Button

Hey, if anyone need, a button to push a task to the top :)

Whished in: https://github.com/HabitRPG/habitrpg/issues/1214
Trello: https://trello.com/c/nytaY3gn/117-sorting-tasks-convert-item-type-by-drag-drop-sort-tasks (Push Task To Top)

Only a tooltip with translation is left, but it works :)