more info on ship stats in ship market

Fixes #1733

I know this will be redone at some point, but until then we need this information when buying ships.

I'm putting it up for review here, because I suspect the way I'm using the language resources are less than pretty, but this way one does not have to translate "atmospheric shields" "fuel scoop" etc. twice (and risking different translation for the same item). However, for "missile mounts" a new string was needed. 

![ba5](https://cloud.githubusercontent.com/assets/619390/2614422/eb538838-bbe6-11e3-9787-f759698dd1f6.png)