Implemented Listeners for VocableTableActions

The BigCharacterBox and the VocableDetailBox are now implementing the
Interface VocableTableActionsListener and register as Listeners to the
VocableTable.
TrainVocablesDialogue implements VocableDeletedListener

When the User deletes one of the Vocables which are also in the list of
trainingVocables during training, the vocable will be deleted from the
trainingVocables as well, so that there is no error when saving the
learn level of a vocable.