fix some minor issues in vehicle menu (see snapshots)

These issues were fixed in current PR.
- exclude excessive underscore:
![bad_text](https://f.cloud.github.com/assets/5421954/1515916/fe13a9dc-4b0a-11e3-8f40-7cbc8e9d2644.png)

- description window too small:
![lack_of_space](https://f.cloud.github.com/assets/5421954/1515917/0374edd2-4b0b-11e3-8368-34ca68e00582.png)