Hi
First of all I guess I should give you the link to gettext documentation:
http://www.gnu.org/software/gettext/...ettext_11.html
gettext is the standard method that open source programmers use to translate their programs
However, the program you chose wasn't designed to work with gettext. It doesn't have a method for localization at all.
If you were to pick another open source project that implements gettext then you can read sections 7, 8 and 9 of the previous link. You can also download one of the translation software meant for gettext in order to create a new translation file.
In order to prepare starfighter for gettext or something similar you would need a good deal of knowledge of programming. You would have to go through the code, find the text that will be printed, and replace them with the correct code.
I hope you aren't more confused about the explanation. Good Luck