Core: Add an indication of the number of hints provided by a quest if ≠ 1

[Dinopony]

Currently, when a quest gives more than 1 hint token when completed, there is no indication of this in the UI.

It should be visible as a tooltip, the same way the description is already handled (by adding a colored question mark having a tooltip when hovered).

This question mark should now appear if quest has a description AND / OR if quest has more than 1 hint as a reward.
If both are enabled, it should display the description first, and the following sentence after a line break : "This quest awards X hint tokens on completion."

Quests that award more than 1 hint are pretty uncommon, but this should make them at least more readable.