bahn.de: Support for direction and comments

I finally found some time to implement one of the frequently requested features: display of direction in journey details. While on it, I also implemented display of journey comments. This seems to be, mainly, information about the facilities available on the train.

I've only tested UI changes on BlackBerry 10. Other platforms where modified "blindly". So better to test it on them before merging (will try to it this weekend, if I have time).