use some nasty logic in template to display ward name correctly

@longhotsummer I forgot that ward doesn't have a `name` attr. I've implemented the name logic in the template for now, for illustrative purpose. I'd prefer if the logic was in the models instead, i.e. `short_name` and `full_name` properties + a `__unicode__` method. What do you think?

I also excluded the district from the name. For large cities, district and municipality names are often the same and the name gets very long.