When opening a door, we don't know what key was used

[christopho]

We have this problem between dungeons 6 and 7 with the Iron Key, the Stone Key and the Wooden Key.
We should be able to add dialogs for this and without help from translators, using dialog "dungeon_5.prison_1_use_iron_key" as a model.

[christopho]

Won't fix. Adding dialogs is not a good idea since the game is finished and many translations were done.